Aishi Family

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From left to right: Ryoba Aishi, Jokichi Yudasei, and Ayano Aishi.

The Aishi Family is an important family in Yandere Simulator, as they are the main family that plays a key and supporting role in the entirety of the game lore.

Overview

The Aishi Family is a bloodline that shares a genetic condition causing a permanent sense of emptiness and emotional numbness. The only way to manage this condition is by finding a person whose physical presence can lessen the effects of the Aishi Condition. This phenomenon is known as the Senpai Effect, and the person who triggers it is referred to as a Senpai. Aside from the condition, each Aishi is unique in their own way.

Most Aishi women desire to give birth at a young age, typically around 18 or 19. However, starting with Kugi Aishi, Aishi women began giving birth at ages 20 or 21. As a result, most become grandmothers between the ages of 39 and 42. The notable exceptions are Ryoba Aishi, who gave birth to Ayano at age 37, and Ryoba’s sister, who gave birth to Ayano’s cousin at age 31. An Aishi typically has no reason to adopt, as she wishes to devote herself entirely to her Senpai and expects the same level of devotion in return. An adopted child would be seen as taking away her Senpai’s attention, focus, and time. Aishi babies do not cry after birth initially. Although the vast majority of those born into the family are women, at least one male member has been born.

Etymology

"Aishi" is a play on words. "Ai" means "love" and "Shi" means "death," with the plural form being Aishi.

History

Silhouettes of the Aishi Bloodline (excluding Ayato).

The Aishi family is a very long line of Yanderes, and their history goes back for over 200 years. The Aishi Precursor was born in 1779, arrived in Japan 18 years later, in 1797, and gave birth to her daughter (The First Aishi) in 1800.

The First Aishi had three children, starting the first "branches" in the Aishi family tree:

• The "Saw" Branch.
  • The branch where Ayano, Ryoba, Dozuki, Kataba, Azebiki, Kugi, Hiki, Kijiyose, Oga, Sameba, and Anahiki are in.
  • All of the members are named after saw blades (excluding Ayano).
  • This branch, as we know it, further splits into three smaller branches: the Textile Worker branch, the American branch, and Ryoba’s sister’s branch.
• The "Sword" Branch.
  • The branch where Katana Aishi is in.
  • All of the members are named after swords.
  • All died at once during one event in the late 1800s.
• The "Sewing" Branch.
  • The branch where Hasami Aishi and the Meiji Era Aishi are in.
  • All of the members are named after sewing tools.
  • This branch, as we know it, branches into one smaller branch: the Scissors branch.

Afterward, there also existed:

• The "Textile Worker" Branch.
  • Kijiyose Aishi's younger sister started the branch. She ensures that the textile business continues into modern times.
• The "Scissors" Branch.
  • The purpose of the scissors is to "cut the red string of fate."
  • The branch where the Aishi disguised as a man and The Noble Aishi are in.
• Arisa Aishi's Branch, also known as "WW2" Branch, or "Soldier" Branch, later "American" Branch.
  • Descendant lives in the United States.
  • The branch where the American Aishi is in.
  • All of the members are named after guns.
    • The ones born in Japan would be named after Japanese-made guns (e.g., Arisaka, Howa, Miroku), and the ones born in America would be named after an American-made gun.
• Ryoba's Sister's Branch.
  • The branch where her and Ayano's Cousin are in.

The third branch was originally going to be called the "Blacksmith" branch, however, YandereDev later changed it.

Among the other branches, there existed:

• An Aishi who was killed by one of her rivals.
• An Aishi who was caught committing murder and was executed or sent to prison.
• An Aishi who had no competition and obtained her Senpai with zero effort (e.g., Dozuki Aishi and Kijiyose Aishi).
• An Aishi who was rejected by her Senpai and killed herself and her Senpai.
• An Aishi who refused to commit violence and chose to use non-lethal methods to obtain her Senpai.
• A pair of Aishi twins who both fell in love with the same Senpai. One of them killed the other twin (this was revealed to be Kugi Aishi and Hiki Aishi).
• An Aishi who deliberately chose to only use violent methods to obtain her Senpai, even though she didn't have to (e.g., Kataba Aishi and Ayano's Cousin).
• An Aishi who never found anyone who triggered the Senpai Effect, remained emotionless for her entire life, and died alone.
• An Aishi who never found anyone who triggered the Senpai Effect, and remained emotionless for her entire life, but accepted someone's marriage proposal for the sake of convenience. She had several children, but she was completely apathetic towards her husband and her children for her entire life.
• An Aishi whose Senpai was the same gender, but due to society being conservative at that time, she had to marry a man and have children whom she didn't even care about.
• An Aishi who realized that the skills she used to obtain her Senpai would make her the perfect spy or assassin, and worked as a ninja. She had several children whom she also trained in the art of ninjutsu. They worked as a very successful ninja clan for several generations and were so good at being unnoticed that they were never recorded in history.
• An Aishi who would willingly kill a child if necessary to get her Senpai.
• An Aishi who secured her Senpai, who died soon after, but rather than taking her own life, she chose to take care of her child as the last piece of him (Sameba Aishi).
• An Aishi In Scissors branch who met their senpai, but her senpai died sometime after, and there she chose to commit suicide.

Their murderous spree began shortly after, with times of a monster hunter coming to the area where an Aishi resided looking for a demon, because of said Aishi murdering a lot of people. Over time, various branches have ceased to exist due to an Aishi's death or them getting caught while trying to eliminate their rivals. Overall, 50% of Aishi have failed to secure their senpai.

The earliest Aishi, who were farmers, were physically the strongest, with some who were "arguably" better at hand-to-hand combat before the 1900s. The other strong Aishis included Arisa Aishi, Kataba Aishi at her peak, and Ryoba Aishi. The majority of Aishi purposefully tend to stay out of the public eye, with the exception of one specific branch that became famous for their high-quality textiles. There are various branches of the Aishi bloodline and they have different levels of wealth. Some of them are struggling to make ends meet, while others are wealthy. In 202X, some Aishi choose to live abroad, while others remain in Japan due to personal attachment or convenience.

The Aishi Family has been monitored by the Central Intelligence Agency (CIA) since the hiring of Kataba Aishi. At some point before 1989, the CIA ceased all types of monitoring on the family.

Aishi in Buraza Town

Main article: Aishi House

The Aishi House, originally owned by Kataba Aishi and her Senpai.

Ayano's great-grandmother, Kataba Aishi, and great-grandfather, Torahiko Aishi, were the first to move to Buraza Town. After moving into their new house, Ayano's grandmother, Dozuki Aishi, asked for a basement, which Kataba agreed to. The basement was constructed in complete secrecy with the assistance of foreigners who were paid handsomely to stay silent about what they were building. Despite the numerous difficulties in accomplishing this task, the basement was constructed within a year. Immediately after its completion, Kataba kidnapped Dozuki's Senpai and broke him there.

The house is currently owned by Ayano's parents, as her aunt, grandparents, and great-grandparents moved out once Ryoba Aishi and Jokichi Yudasei married. Despite the Aishi family's attempts at remaining relatively unnoticed, The Journalist, Kocho Shuyona, and Megami Saikou are aware of them, and despise them as they see them as threats to humanity. It's possible that Info-chan, Saisho Saikou, and Ichirou Saikou are also aware of the bloodline, but do not view them as threats.

Torture

Main article: Torture

In the 1800s, the Aishi discovered a torture technique that could turn a person into an obedient slave. which has been passed down throughout their family for generations.

The basement that Sureibu Aishi was tortured in, and Jokichi Yudasei held hostage in.

The technique is not physically damaging to the victim; it is entirely and wholly psychological. It's similar to a form of hypnosis, where the Aishi would hypnotize the victim into thinking that they're experiencing various types of extreme physical torture, while in reality, nothing is happening. This, combined with the Aishi giving the victim hope that they can escape, and then yanking the hope away, gradually conditions the victim to believe that there is no reason to consider resistance or imagine a better future. Once the victim is completely convinced that there is no hope and that their life is already over, their mind enters a "malleable" state where they can be re-shaped into anything their captor wishes for them to be - even a pet. After turning into a malleable state, the Senpai is usually sitting there, with unfocused eyes, not speaking, thinking or doing anything unless instructed to.

Condition

The Aishi Condition portrayed in Ayano Aishi's intro.

The Senpai Effect or Condition, is an effect where an Aishi is attracted to one specific human on Earth. It can be triggered only once, and only when an Aishi has reached some level of physical maturity, typically around 18 to 20 years old, with only 1 in a million people meeting the criteria to trigger it. After an Aishi has encountered someone who can trigger the effect, she can only be attracted to that one human on earth, unable to share them with anyone else. The condition cannot be triggered by a supernatural being. The condition has affected Ayano's ancestors for centuries, and the story of its origin was passed down from generation to generation. Now, however, it's considered a fairy tale, as Aishi have stopped taking it seriously. The condition makes them feel depressed, emotionless, and incomplete. The condition's strength decreases, and affects both Male and Female Aishi. The effects of the condition are very powerful, making Aishi lose control of themselves and preventing them from talking in the presence of their Senpai. As such, It is only after 10 weeks that an Aishi will confess.

The exact criteria that someone must meet to trigger the effect are unknown to them, only that the person has to be older than the Aishi, even by a second. Sometimes, their birthdays were only days apart, although some unusually large age gaps of even 20 years were present at some point in the family's history. However usually the difference is really small, of around ~0-2 years. To deceive the family of their Senpai, the Aishi forges her Senpai's handwriting and writes a letter to his parents, explaining that "they fell in love with a girl and eloped." After being married to their Senpai for some time, the Aishi regain the ability to form genuine friendships or have interests independent of their Senpai's. After 50 years of marriage, the Aishi doesn't feel the condition, and can experience life the same way as any other human.

Some Aishi, once finding someone who triggers the Senpai effect, assume that they have fallen in love with them, while others believe that their Senpai is a treatment for their very rare "medical condition." They "coldly view" their Senpai as their medicine, and opt to mind break them. They think of him the same way that a person who is dependent on oxygen tanks to breathe thinks of their oxygen tanks. But If an Aishi simply never meets a person who triggers the Senpai Effect, they'll go their entire life suffering from the condition. Other Aishi don't look down on them or consider them to be a shame; they feel pity for them more than anything else.

Due to the Condition, an Aishi's life is tied to the life of their Senpai. If their Senpai dies while they're still experiencing more than 66% of the condition, or before around 21 years of being married, they kill themselves, as their life has lost its meaning. If their Senpai dies while she is experiencing somewhere between 66-33% of the condition, or 21-55 years of being married, they may or may not kill themselves, depending on their specific personality. They may decide that although bad, their life is bearable because it's not as bad as it was originally. If an Aishi believes they have lost their Senpai forever, they're very likely to SNAP - enter a phase where they don't feel pain, and their only goal is to murder their Senpai and then themselves, as they don't see a reason for them to live anymore. The only way to prevent bloodshed is the death of the SNAPing Aishi.

The cruelty of an Aishi's actions to carry on their goals to maintain their new intense emotions will depend on them individually. There have been several Aishi who mind-broke their husbands, such as Dozuki, and other, who avoided doing so, like Ryoba. There have also been members who avoided or did not use bloodshed to obtain their Senpai. There had been members, such as Ayano, who is capable of finding pacifist methods to eliminate their rivals. Some Aishi also view their actions as self-defense, as they realize that the life they lived before finding their Senpai was no different than death. They cannot see hurting others as terrible if they feel hollow, but they can reflect back on their past actions, and feel tremendous guilt over what they have done throughout their life.

Multiple variations of the condition can include:

• An Aishi who realizes the effects of the condition vanish in one person, she assumes to herself that it is love.
• An Aishi who feels no love for her Senpai, sees him as "medication."
• An Aishi who originally saw her Senpai as medication, but developed genuine love for them.
• An Aishi who thinks she loves her Senpai, gradually realizing that her attachment to them is not romantic or emotional. She grows to resent them, and eventually deals with this resentment by mind-breaking them.

Aishis also tend to be very pragmatic people, they do not bother forming personal connections as they only see other humans as obstacles or tools. As a result, the only people an Aishi can actually show love and care to is their Senpai and family members. An Aishi would never kill another Aishi's Senpai, unless in a situation where the latter Aishi or their Senpai was to blame for their own Senpai's death.

Traditions

All the Aishi family members in the "Saw Branch," except The Aishi "Precursor," Ayano and Ayato are named after saws and blades, and Ayano's child would also have a name that sounds like a blade.

Only the firstborn daughter is named after a saw or blade. The second-born daughter is named after something else, and starts a "branch" where the tradition is to name daughters after that thing, instead.

However, Ayano's name was a result of her father incorporating his "wish" into her name by inputting the Japanese character for color (彩) in hopes that his daughter wasn't going to be like the rest of her maternal family. If they "run out of" names for their children, an Aishi may reuse a name from one of their ancestors for their child. They often convince their Senpai to continue the naming convention by excusing it as a century long tradition.

Canonically, Aishi give their kids names that they think are "pretty," but behind the scenes, each Aishi's name has some kind of double-meaning or purpose. In a regular Aishi family, the Aishi (Mother) spends more time with the child, and they usually don't care about their birthdays.

It has been a family tradition for two and a half centuries, that when an Aishi woman marries a man, the husband adopts the wife's surname. There have been some branches who took the husband's surname.

Appearance

All of the Aishi look almost identical to one another. YandereDev imagines all of Ayano's ancestors with the same hairstyle, even if it feels goofy to him. The vast majority of Aishi had black hair and black eyes, however, not all of the Aishi have the same physical traits.

The majority of the Aishi often share the same hair two hair colors, either black or dark gray. However, Ryoba's Sister is an exception to this trait, as her hair isn't either of the latter colors. She gets her hair color from her father, but is yet to be confirmed.

Some Senpai didn't have black hair. One notable example is Dozuki's husband, Sureibu Aishi, who has pink hair, although his current illustration depicts him with dull purple hair. YandereDev says that Ryoba sister's hair could be either bright pink or black.

Relationships

Family Members

The Aishi family members aren't very close. Once an Aishi has found a partner, they tend to distance themselves from the family. There have been noted cases of "black sheep" in the family, such as Dozuki being regarded as a "spoiled lazy-ass brat," Ayano's Cousin being too full of herself, and Ayano being "weird" due to her general numbness. One common belief that every Aishi shares that is if they see one of their family members get accused of murder, their first response would be that they definitely committed the murder. This is because every Aishi is either skilled with serial killing, or knows that their entire bloodline is skilled at serial killing. Many Aishi see their family members as tools and sources of information, hence why they stay on respectful terms. Many Aishi see each other as the only ones who can understand the unique condition they have.

When members of the Aishi family do meet, they will most likely exchange advice on getting away with murder. For example, Ayano's cousin would help Ayano in a parking lot to do additional tutorials like Kokona's tutorial.

The Aishi's family reunion, which takes place every 5 years, takes place in Tokyo. So, Kataba has only seen Ayano 4 times. Once as a newborn baby, once as a 5-year-old, once as a 10-year-old, and once as a 15-year-old.

Their Senpai

All known Senpais of the Aishi family as silhouettes. From left to right: Kanehira, Hodaka, Hanzo, Torahiko, Sureibu, Jokichi, and Taro. (excluding Taeko).

Each Aishi is attracted to one specific human on earth, nobody else. Their attraction is not physical or sexual. Instead, most view their Senpai as a cure to a disease that they've been suffering from.

A Senpai can influence Aishi's personal growth and development. An assertive Senpai could use emotional leverage to persuade his Aishi to avoid murder, but the Aishi will never stop having murderous urges towards anyone who seems like a threat. If their "Senpai" is meek and submissive however, they would not influence their Aishi's development. The Senpai is not aware that they can produce the effect, unless the Aishi explicitly tells them.

Depending on the influence their Senpai had on them, they would react to their death differently. They might enter a coma-like state, might fly into a blind rage and kill everyone around them, or might try to live a normal, happy life without them. This is heavily dependent on what type of Senpai they acquired, and how they influenced their personal growth and development during their marriage. It is also dependent on how their Senpai died. If they died of illness, the Aishi would feel as though nobody is to blame. If they were murdered, the Aishi would seek revenge.

An Aishi would feel closer to their Senpai when they do something that their partner likes/enjoys, such as listening to the same music as them, wearing a color they like, etc.

If an Aishi loses their Senpai before they have developed the capacity to experience emotions, they would feel as if they have permanently lost the capacity to hear music, see color, and feel warmth. This may lead them to fall into an extremely deep depression that leaves them in a coma-like state. However, if an Aishi loses their Senpai after they are no longer dependent on their presence, they would not fall into the coma, but would still feel an extremely deep sense of loss and pain that is far beyond what a normal human would feel at the loss of a loved one.

If their Senpai goes to war, the Aishi would follow their Senpai. Ayano's great-great-grandmother, Azebiki Aishi, had a younger sister, Arisa Aishi who was born in 1919. When she was 18 in 1937, her Senpai, Hanzo Aishi joined a Guerrilla warfare squad on World War II to sabotage the Imperial Japanese Army. Worrying about her Senpai would get caught, Arisa took on a Japanese soldier's identity to also join the army and protect him from being caught. This was because women were not allowed to be soldiers while Japan was experiencing WW2.

YandereDev describes her as the closest comparison to Mulan. As she was his "guardian angel" in combat, following him around and saving him from death by killing any enemy who was plausibly considered a threat to him. Concept art for Arisa can be seen here.

If a Senpai had a child before their relationship with an Aishi, the latter would hate the child, as it would be a nasty and lingering reminder that their Senpai loved someone else at one point in time.

There is a kinship among the various "Senpais." They give each other advice on how to co-exist peacefully with serial killer wives who they cannot escape. Still, they are all their unique individual and how close they become with one another will depend on their personalities.

In a case of a person of the same sex triggering the senpai effect and entering a relationship with an Aishi, they'd still find a way to continue their family line, but likely not through an adoption, unless their Senpai desired it "for some reason." If their gay Senpai was uninterested in a romantic relationship with them however, they'd kidnap and mind break them, keeping them as a pet.

Their Rivals

Main article: Rivals

An Aishi does not have any strong opinions about their rivals, besides seeing them as threats and obstacles to their Senpai. They don't care about the rival's personality, traits, items related to them, flaws, or anything about them entirely.

Almost all Aishis have a total of 10 rivals, the exception goes to Ryoba who has 11 rivals and Dozuki who have no rivals to avoid trouble.

Members

Main

This is a section of all main characters in the main story mode and 1980s Mode.

Ayano Aishi

18 (202X) | Alive

Ayano is the daughter and only child of Ryoba Aishi and Jokichi Aishi. She's the protagonist in 202X Mode.

Since early childhood, Ayano has suffered from an inexplicable and incurable condition, as condition that every direct member of her family has suffered from. Essentially, this condition gives her a constant feeling of emptiness, hollowness, and incompleteness, and her ability to feel emotions is significantly diminished compared to others. Ever since the Aishi family has had this condition, it has weakened with each new generation of Aishi, allowing for a greater capacity for emotion. However, for reasons unknown to any of her family members, Ayano suffers from the Aishi Condition nearly as acutely as the very First Aishi, despite the fact she *should* experience less than anyone else in her family. As a result, she has never experienced true satisfaction, fulfillment, or happiness. As she grew older, she learned to mimic normal behavior to avoid drawing negative attention, but she was never able to develop real empathy for other people.

Ayato Aishi

18 (202X) | Alive

Ayato Aishi is the male counterpart of Ayano Aishi.

At this time, he is merely hypothetical and does not exist.

However, he exists in an alternative universe along with Taeko Yamada.

Ryoba Aishi

18 (1980s Mode) | 55 (2026) | Alive

Ryoba Aishi is the mother of Ayano Aishi and the daughter of Dozuki Aishi. She's the protagonist in 1980s Mode.

Ryoba attended the same school as her daughter in 1988-1989. She and her husband are out of the country for ten weeks in 202X Mode because she's hunting on the Journalist, as stated in the postcards.

Jokichi Aishi

18 (1980s Mode) | 55 (2026) | Alive

Jokichi Aishi (né Yudasei) is the husband of Ryoba Aishi and father of Ayano Aishi. He's the protagonist's senpai in 1980s Mode.

He and his wife are out of the country for ten weeks in 202X Mode because his wife is hunting The Journalist, as stated in Basement Tape #10.

Minor

This section is about all the characters who are the supporting/minor Aishis.

A few Aishis have appeared in the 1980s Mode, with only Dozuki Aishi and Kataba Aishi being implemented as fully NPCs and one senpai, Sureibu Aishi.

Ayano's Cousin

19 (202X) | Alive

Ayano's cousin is the daughter of Ryoba's Sister. As a result of feeling and expressing her emotions more than her cousin, she is arrogant and full of herself. Often giving unsolicited advice to other Aishi family members and having a sadistic streak of her own.

Ayano's cousin is a societal rebel who actively challenges established norms, yet maintains a positive, conflict-free relationship with her parents.

Ayano's cousin wouldn't play any role in the game, however, she would offer additional tutorials, similar to the in game Kokona's Tutorial.

American Aishi

24 (202X) | Alive

The American Aishi is the daughter of Arisa Aishi's Granddaughter and the third cousin once removed of Ayano Aishi.

As the first Aishi born outside of Japan, she possesses the personality of an anxious teenage girl. Additionally, she cannot speak Japanese.

The American Aishi has not found her Senpai yet, and she lives in the city of Los Angeles, California.

The American Aishi would be named after an American-made gun, possibly Kimberly.

Ayano's Aunt

13 (1980s Mode) | 18 (1994) | 50 (2026) | Alive

Ryoba's Sister is the mother of Ayano's Cousin, and the younger sister of Ryoba Aishi. She is described to have a different hair color than the rest of her family members, as she inherited the trait from her father.

According to YandereDev, if he ever decided to make a prequel to Yandere Simulator, he would name it "Yandere Simulator Zero" and have Ryoba's Sister as the protagonist of the game. The game would be set in the 1990s.

Ayano's Uncle

13 (1980s Mode) | 18 (1994) | 50 (2026) | Alive

Jokichi did talk to Ryoba's Sister's senpai, but not extensively. His relationship with her senpai shares the same traumatic experience as being married to someone who they know is a serial killer.

Arisa's Granddaughter

51 (202X Mode) | Alive

Arisa Aishi's Granddaughter is the daughter of Arisa Aishi's Daughter and Ayano's second cousin twice removed.

She immigrated to the United States in 2000 and gave birth to the American Aishi. The reason she immigrated to America is that her family didn't like Japan.

She would be named after a Japanese-made gun.

Arisa's Daughter

18 (1968) | 39 (1980s Mode) | 76 (202X Mode) | Alive

Arisa Aishi's Daughter is the daughter of Arisa Aishi and Ayano's first cousin thrice removed.

She would be named after a Japanese-made gun.

Dozuki Aishi

18 (1968) | 39 (1980s Mode) | 76 (202X Mode) | Alive

Dozuki Aishi is the daughter of Kataba Aishi and Torahiko Aishi, the wife of Sureibu Aishi, and the mother of Ryoba and her sister.

She's the laziest and the most spoiled out of all the Aishi to the point where her mother took care in raising Ryoba, and is the reason as to why there's a basement in Aishi House.

Sureibu Aishi

18 (1968) | 39 (1980s Mode) | 76 (202X Mode) | Alive

Subaru "Sureibu" Aishi (né unknown) is the husband of Dozuki Aishi, and the father of his two daughters, Ryoba and her sister.

He got kidnapped by Kataba Aishi and was mindbroken by his wife until he became empty shell of a human being.

Kataba Aishi

18 (1948) | 59 (1980s Mode) | 96 (2026) | Alive

Kataba Aishi is the mother of Dozuki Aishi, the daughter of Azebiki Aishi and Hodaka Aishi, the wife of Torahiko Aishi and a former CIA agent.

She obtained her Senpai through lethal eliminations, and successfully confessed to him, but got caught by the CIA for her crimes. However, before facing trial, she was offered a deal to work as a CIA agent in exchange for not facing justice.

Kataba extensively spoiled her daughter after every trip, as she worried her long absences would make her daughter not love her.

Before the events of 1980s mode, Kataba no longer works as an CIA agent and the CIA no longer defends the Aishi Family.

Torahiko Aishi

18 (1948) | 59 (1980s Mode) | 96 (2026) | Unknown

Torahiko Aishi (né Yaginuma) is the father of Dozuki Aishi and the husband of Kataba Aishi.

Kataba met him at the age of 18 during high school, and after eliminating her ten rivals and confessing to him, Torahiko accepted her feelings.

For most of his marriage, he believed that Kataba murdered the other girls due to her war trauma. After learning about Kataba's true intentions and the Aishi Condition, it took years until he finally grew to accept, or at least tolerate, his wife and her family again.

Arisa Aishi

18 (1937) | 107 (2026) | Alive

Arisa Aishi (also known as WW2 Aishi) is the wife of Hanzo Aishi, the aunt of Kataba Aishi, the younger sister of Azebiki Aishi, the youngest daughter of Kugi Aishi and Kanehira Aishi, and a soldier that enrolled through disguise and false identification in order to protect her "weak" Senpai from war.

Despite having a "teacher-student" dynamic, and decent enough relationship, with her older sister, Arisa was crueler, sadistic, and enjoyed killing, resembling her mother far more in personality.

Hanzo Aishi

18 (1937) | ?? (????) | Deceased

Hanzo Aishi (né unknown) is the husband of Arisa Aishi.

He was born in 1919 in Kyoto, Japan, to a physician father and a teacher mother, and was raised in a loving household, aspiring to be a doctor growing up. Drafted into the Imperial Japanese Army in 1937 as a medic, he faced moral conflicts in war-torn China, secretly aiding civilians.

Disgusted by his comrades' cruelty, he sabotaged the army and warned villages, aided by Arisa Aishi, a disguised classmate who was in love with him. After a near-execution, Arisa rescued him, and they joined the Chinese communists Eighth Route Army as guerrillas for six years. Post-war in 1945, Hanzo testified against war criminals, then returned to Japan, hiding his past. His resentment shaped his descendants' move to America.

Azebiki Aishi

18 (1928) | 79 (1980s Mode) | 116 (202X) | Alive

Azebiki Aishi is the eldest daughter of Kugi Aishi and Kanehira Aishi, the mother of Kataba Aishi, the wife of Hodaka Aishi, and the older sister of Arisa Aishi.

She spent all her life studying the Aishi Condition: its origins, its mechanisms, and the possibility of a cure. Her younger family members treat her with respect, acknowledging her long years of research into their shared condition.

According to the game's website, she's still missing "the final puzzle piece."

She shares an uncanny resemblance with her deceased aunt, Hiki Aishi.

Hodaka Aishi

18 (1928) | 79 (1980s Mode) | 88 (1998) | Deceased

Hodaka Aishi (né unknown) is the father of Kataba Aishi and the husband of Azebiki Aishi.

Hodaka comes from a rich family, and all Azebiki's rivals only wanted to marry into wealth. He worked as the janitor of Azebiki's college so that Azebiki would never have to be far away from him.

Hiki Aishi

18 (1908) | Deceased

Hiki Aishi is the twin sister of Kugi Aishi, daughter of Kijiyose Aishi and the aunt of Azebiki Aishi and Arisa Aishi.

She was kind and gentle, the complete opposite of her twin sister. After finding out that she and her twin sister both fell in love with the same boy, Hiki, not wanting to murder her sister, tried to compromise and considered that the sisters could share the boy. Before she could even process what was happening, her twin sister slit her throat and left her to bleed out, before quickly destroying all evidence.

Two years after her death, her niece Azebiki was born, sharing an uncanny resemblance to the deceased Hiki.

Kugi Aishi

18 (1908) | 99 (1980s Mode) | 122 (2012) | Deceased

Kugi Aishi is the twin sister of Hiki Aishi and the mother of Azebiki Aishi and Arisa Aishi.

She was cold, sadistic, and could seem almost heartless at times. After finding out that she and her twin sister both fell in love with the same boy, she slit her throat and watched as Hiki bled to death.

Two years later, she gave birth to Azebiki, but grew more and more uncomfortable, due to her child looking identical to her murdered twin. Nearly a decade later, she gave birth to Arisa, who turned out just like her mother.

As she got older, she began to feel more and more guilty in regards to her sister's death.

She lived to the age of 122, having died in 2012. She is the first oldest Aishi that has passed away.

Kanehira Aishi

20 (1908) | ??? (???) | Deceased

Kanehira Aishi (né unknown) is the husband of Kugi Aishi and the father of Azebiki Aishi and Arisa Aishi.

He was originally in love with Hiki, but after her "mysterious disappearance," her twin sister Kugi came to comfort him, and he slowly began developing feelings for her. In secret, he would use the fact that Kugi was virtually identical to Hiki to pretend that she "was" Hiki as a coping mechanism, but he kept this fact extremely private as to not ruin his and Kugi's relationship.

He was somewhat unsettled by how Kugi treated Azebiki more and more coldly over the years, while being a good mother to Arisa, but he compensated for it by doting on his eldest daughter.

Kanehira believed that Kugi's coldness was a psychological defense mechanism to cope with her twin sister's death, and never learned the truth.

Kijiyose's Sister

??? (???) | ??? (???) | Deceased

Kijiyose Aishi has a younger sister

She started the "Sewing" branch, ensuring that the textile business continues into modern times.

Kijiyose Aishi

18 (1890) | ??? (???) | Deceased

Kijiyose Aishi is the fifth-generation Aishi and the mother of Kugi and Hiki Aishi.

She was born into a wealthy textile family, growing up wanting for nothing. Haunted by an inherited sense of emptiness that only touch with her soulmate could cure, she obsessively sought physical contact with others under the guise of customer service.

When her hometown yielded no answers, she became a traveling merchant, charming but perfectly capable of bloody self-defense to continue her quest. After countless encounters, she finally found her soulmate, felt complete, and married him.

She later gave birth to twins, Kugi and Hiki, and despite knowing that she was passing down her condition to her children, Kijiyose was determined to help them find their own soulmates.

Kijiyose's Senpai

??? (???) | ??? (???) | Deceased

Kijiyose's Senpai is the father of Kugi and Hiki Aishi and the husband of Kijiyose Aishi.

He is a merchant and was devastated when Hiki disappeared without explanation.

Oga Aishi

18 (1872) | ??? (???) | Deceased

Oga Aishi is the fourth-generation Aishi and the mother of Kijiyose Aishi and her sister.

Her mother was a brilliant but unknown textile artist in a rural town. Determined to gain recognition for her, Oga developed the necessary skills and spread her mother's fabrics by making clothes for travelers. Her plan succeeded, as Oga's mastery of trade created an extremely successful business, drawing national attention and transforming her family's lives, until the Aishi name became one of the most prestigious in Japan.

Despite her success, Oga felt a deep, inner emptiness, until a brief touch with a customer made her feel whole. Convinced the man was her soulmate, she pursued him, and thanks to her business, managed to marry him quickly.

In 1872, she gave birth to her eldest daughter, Kijiyose, and vowed to help her find happiness if she ever felt the same emptiness Oga once did.

Like her mother Sameba and grandmother Anahiki, Oga has also killed at least 10 people, though the circumstances of her need to kill someone are unclear.

Oga's Senpai

??? (???) | ??? (???) | Deceased

Oga's Senpai is the father of Kijiyose Aishi and her sister and the husband of Oga Aishi.

He was surprised by how quickly Oga fell for him, but realized he was lucky that a woman with such great status and wealth wanted him, so found no reason to turn her away. They moved from being strangers to lovers very fast, and when she proposed marriage, he accepted right away.

Meiji Era Aishi

??? (???) | ??? (???) | Deceased

The Aishi wearing the European dress was probably the wife of a merchant who was part of the supply chain that was bringing European dresses into Japan. She might have been born in the Meiji Era, when Western-style fashion (yōfuku) was first adopted most widely in Japan.

It is confirmed that she is in the "Weaver" branch.

Noble Aishi

??? (???) | ??? (???) | Deceased

The Noble Aishi was likely a concubine within a high-ranking household, chosen for her beauty, refinement, or family connections.

The Noble Aishi is in the "Scissors" Branch.

Aishi Disguised as a Man

??? (???) | ??? (???) | Deceased

The Aishi who disguised as a man is "Defying Fate." She would be in the "Scissors" Branch, since the purpose of the scissors is to "cut the red string of fate."

Sameba Aishi

18 (1854) | ??? (???) | Deceased

Sameba Aishi is the third-generation Aishi, daughter of Anahiki Aishi and the mother of Oga Aishi. After the death of her husband, Sameba chose to continue living for her daughter, Oga, however, she entered a broken state similar to that of a living machine, dedicated only to caring for her daughter and creating textiles and fabrics, working up until the moment of her death.

Like her mother, Sameba has also killed at least 10 people.

Sameba's Senpai

??? (???) | Deceased

Sameba's Senpai is the father of Oga Aishi and is the husband of Sameba Aishi.

He was popular as a young man, and several other women were vying for his attention during his single years.

Just when Oga turned one year old, he abruptly fell ill and died, leaving his wife devastated to the point of almost committing suicide.

Hasami Aishi

18 (1838) | ??? (???) | Deceased

Hasami Aishi is the youngest sister of Anahiki and Katana.

She started the third branch of the Aishi bloodline, the "Weaver" branch.

Katana Aishi

18 (1837) | ??? (???) | Deceased

Katana Aishi is the younger sister of Anahiki Aishi and older sister of Hasami.

She started the "Ninja Clan" branch, so she had to have a lot of kids. Her silhouette was confirmed by YandereDev.

Anahiki Aishi

18 (1836) | ??? (???) | Deceased

Anahiki Aishi is the second-generation Aishi and the eldest child out of three children.

She started the "Saw" branch, that has all of Ayano Aishi's ancestors.

Like her mother Aishi, Anahiki has also killed at least 10 people.

Anahiki's Senpai

??? (???) | Deceased

A blacksmith who became the husband of Anahiki Aishi and the father of Sameba Aishi. It's unknown if he was still alive by the time Sameba lost her own husband, or if he simply didn't know or didn't care.

The First Aishi

18 (1818) | ??? (???) | Deceased

The "First" Aishi, simply named "Aishi" by her adoptive parents, Jiro and Oume, is the first-generation Aishi and the mother of three children.

Known through her descendant's studies, Aishi was apparently abandoned as a baby and adopted by Jiro and Oume, who were infertile but yearned to start a family.

She is the founder of the three branches: "Saw," "Ninja Clan," and "Weaver."

The First Aishi has killed at least 10 people.

The Aishi Precursor

18 (1797) | 51-91 (1830-1870) | Deceased

The Aishi Precursor was the first member of the Aishi Family, having started the lineage with her Senpai.

She was most likely a monster hunter.

The Aishi Precursor's Senpai

18 (1797) | ??? (???) | Deceased

The Aishi's Precursor's Senpai was held hostage by a paranormal being, and after being saved by the Aishi Precursor, he buried the demon under the Confession Tree hill alongside his lover. Not long after marrying each other, the couple had one daughter, but for yet unspecified reasons, ended up abandoning their child.

Trivia

• YandereDev thinks it would be uncharacteristic for Aishi to believe in any religion.
• In 202X, the Aishi with the most "knowledge, skill, and experience in getting away with murder" would be Ryoba Aishi.
• YandereDev has written a lot of backstories for many Aishi, but the fanbase will only learn about them if they ever get profiles on the official site.
• The family torture method does not work on the Basu sisters.
• Ayano may have the ability to find the "solution" to the Aishi Condition as an alternate ending instead of pursuing her Senpai, however, it will only be within the first week.
• After 1900, the average Aishi has a very long lifespan. Many of them live to be past 100, with one even reaching the age of 122.
  • No Aishi has lived past 122.
• After cataloguing the entire family tree, YandereDev plans to create a cruelty scale to rank every Aishi and their actions that define how cruel they were in their life.
• There are some Aishi with friendly personalities, such as Oga, Kijiyose, Hiki, Kataba and Ryoba.
• The Aishi Condition is known by a few superstitious family members as a "curse," while the others refer to it as a hereditary medical disorder that is caused by their genes.
• Aishi is capable of experiencing romantic feelings and sexual attraction exclusively towards her senpai even after Aishi's condition is cured upon reaching 50 years of marriage.
• Under the influence of the Aishi Condition and having the choice between committing suicide or breaking her Senpai's mind, no Aishi would choose suicide.
  • However, after 50 years of marriage and being cured of the Aishi Condition, some Aishi are willing to sacrifice themselves for their Senpai if they truly love and care for them. Such Aishi include Kataba and Ryoba.
• Gradually, over time, Aishi's condition with each descendant should completely disappear.
• Some Aishi told their senpais the truth about their condition. Some Aishi told their senpais a softened version of their condition. Some Aishi didn't tell their senpais anything about their condition at all.
• Before late August, Ayano Aishi was in the "Textile Worker" branch; this was changed and replaced with "Saw." The "Textile Worker" branch (currently called the "Sewing" Branch) only has Oga Aishi's 2nd/last daughter (Kijiyose's sister) and her descendants.
• Most Aishi tend to have less than two kids, with the exception of the "Ninja Branch," who would have a maximum of five kids.
• All of the Aishis repeat their sentences from their ancestors to other family members, generations.
• The past Aishis learned the basics of technology from the present Aishis (such as checking e-mails), but they didn't master the recent technology until their death.

Quotes

I fell in love with a girl and eloped.

— The hypothetical letter to the Senpai's parents forged by an Aishi.

I finally found the medicine for my condition!

— First hypothetical reaction from an Aishi who found their Senpai.

What is this feeling? Is this...love? I guess this must be what love is! I guess I must be in love!

— Second hypothetical reaction from an Aishi who found their Senpai.

Oh, it wasn't love. He's basically "medicine" to me, and I mistook it for love.

— First hypothetical reaction to realizing what the Aishi's senpai meant to them.

I have no point of reference for what love is, so I still think this is love!

— Second hypothetical reaction to realizing what the Aishi's senpai meant to them.

yep, she definitely committed that murder...

— A hypothetical and instinctual response from an Aishi if she saw that another one of her family members got accused of murder.

All of my ancestors going back (X) generations are named this way.

— An Aishi hypothetically convincing their Senpai to continue the naming tradition.

...why change the era? Sounds kind of arbitrary. I guess the leadership just wanted to feel like they were doing something significant.

— Hypothetical thoughts of the Aishi Family of a new era.

This person is either a tool, an obstacle, or an inconsequential object in my environment.

— How most Aishi see their own family members.