Osana Najimi
Student Info
Role Rival,
Senpai's Childhood Friend
Class 2-1
Club No Club[1]
Persona Lovestruck[2]
Tsundere (10/16/2016-10/18/2017)
Crush Senpai
Strength Very Weak
Appears Week 1
Games Kuudere Simulator 3
Voice Brittany Lauda[3]


Osana Najimi is the first introduced rival[5] and a female student at Akademi High. She will be used as a tutorial at the beginning of the full game.[6]

YandereDev is currently completing some a few key game features before implementing her into the game. He is expected to release her somewhere in July.[7]



Rival-chan near a tree

Original Osana.

Osana's original look was Raibaru Fumetsu's current appearance.

Osana had light orange eyes and golden-orange hair tied up in two short pigtails. Her hair was tied up in two pink scrunchies with white polka dots and she had a light purple bow on the right side of her head. She wore white leg warmers similar to the ones the bullies wear.


Osana Najimi Full

Osana's current appearance has orange eyes and hair, which is tied into twin-tails that reach her knees. The ends of her hair fade into a small blonde gradient. She has a bust size of 1. To keep Osana's hair tied, there are thin salmon-pink scrunchies with white polka dots. She also wears matching stockings. Her shoes are black and she wears a small red bow on the right side of her head.

As of the March 15th, 2018 Build, her hair and eyes are much lighter and her hair gradient starts further up. This appearance was mistakingly made available to players.[8] As of the March 31st, 2018 Build, she has retained her lighter hair and eyes but slightly less saturated. YandereDev stated that this happened because he wanted to test out features.


"Osana and Senpai have been close friends ever since they were very young children. They have always lived next door to each other, and have always walked to school together.

Despite their closeness, Osana is quite rude and harsh towards Senpai; she is always easily irritated and quick to anger when he is around. The reason for this behavior is because Osana has developed romantic feelings for Senpai, but is afraid of letting him know how she truly feels about him.

She doesn't want him to know how she truly feels about him, so she is mean to him at almost every opportunity. However, her true desire is to confess her feelings to him underneath the cherry tree behind the school...and if nothing stops her, that day will come very soon."[9]



In the original introduction of the game, after Ayano Aishi bumps into Senpai, she can be seen talking to him, acting like a stereotypical tsundere. The first introduction can be seen on YandereDev's YouTube channel, but the introduction is now outdated.

In the second introduction added in the August 15th, 2015 Build, Osana is mentioned by Info-chan, as she requests for Ayano to murder Osana. Info-chan expresses that she wants Ayano to "make her suffer". It is currently unknown what grudge Info-chan holds against Osana.

The updated version of the second intro, added in the June 15th, 2019 build, is slightly different from the original second intro, but now features graphics. In this cutscene, Osana and Senpai are seen talking near one of the bathrooms. The Osana and Senpai talking animation loops, the surroundings are blacked out, and the animation is seen through the hollow in Ayano's silhouette.  Ayano then expresses that she wants to kill or hurt Osana. During the Info-chan texting sequence, the dialogue was not changed and, according to the paragraph above this: "Info-chan expresses that she wants Ayano to 'make her suffer' It is currently unknown what grudge Info-chan holds against Osana."


Osana Najimi is a tsundere, meaning she is hostile and cold towards someone she likes before warming up and becoming sweeter to a person eventually. She seems to be much nicer to girls and her other friends, as she is polite and visibly grateful to Ayano when she completes Osana’s task. Regardless of her rudeness and Senpai's ignorance, Osana is still very considerate. It is implied that Osana has many connections or experiences with boys (as shown with her conversation with Raibaru on the rooftop, her phone call, and that she even stated during her confession that many boys ask her out).



Osana's reputation graph.

Osana's default reputation is -9.

Liked: 10

Respected: 50

Feared: 0


Osana is an only child.[10] YandereDev doesn't imagine her mother to be tsundere.[11]

Osana and Senpai attended the same middle school.[12] They have probably known each other for over a decade.[13]


Though it is unknown at the moment, YandereDev has said that her routine will put Osana in close proximity to Senpai, Raibaru, or other students.[14]

If Osana was put into the game via changing file names in the October 16th update, she would go to the roof, take a phone call, go to the roof, go to class 3-2, and stand there at the back for the rest of the day. She wouldn't take the phone call on Monday.

If Osana was put into the game via changing the file names in the November 15th update, she would stand in front of Senpai looking at the fountain, take a phone call, go back to the fountain, go to class 2-1, and sit down for the rest of the day.

As of the January 3rd, 2017 Build, it was no longer possible to add Osana into the game via the JSON folder. If the player attempted to add Osana, they will encounter Fun Girl instead.

As of the March 31st, 2018 Build, if added to the game, Osana will socialize with Raibaru Fumetsu every day and take a phone call on Monday.

As of the May 3rd, 2018 Build, if added to the game, Osana will socialize with Raibaru every day, and will not take her phone call, nor will she patrol clubrooms.


As of the March 15th, 2020 Build, if Osana was put in the game, then the player set the trap bucket that contains gasoline, Raibaru will warn Osana about the smell of gasoline once Osana opens the door that contains a bucket with gasoline. Osana will now dodge buckets of gasoline, as Raibaru has warned Osana that there's a bucket that contains gasoline. However, setting a trap of a bucket containing water or blood still works for Osana.

As of April 2020 Builds, if Osana was put in the game, then the player gives a salty snack from the vending machine to her, Osana will not accept the salty snack from the vending machine. Even though she was hungry, she will feel tempting and doesn't feel alright if she eats the salty snack. Although it's not possible to give salty snack to Osana, the player can only give salty snack to Osana if the player starts tracking "Vandalizing School" from the expulsion method after the player sabotage the yellow vending machine with screwdriver.

As of May 2020 Builds, if Osana was put in the game, then asked to follow the player, Osana will refuse to follow them, as she doesn't trust them enough. However, asking Osana to distract someone else and leave the area still works.


The topics towards Osana are (Negative/Positive/Neutral) as follows:


  • Cats
  • Occult
  • Science
  • Violence
  • Gaming


  • Cooking
  • Music
  • Sports
  • Gardening
  • Drama


  • Everything else



Main Article: Senpai

Osana and Senpai are close childhood friends and regularly spend time together, meeting together in the morning every day. She, Senpai, and Hanako all played together when they were younger.[15]

Osana has a crush on Senpai, but he is oblivious; as a result, she tries to impress him in the days leading up to her confession.

If Osana entered a relationship with Senpai she would give him "tough love" and would lecture him about leading a carefree life and would encourage him to pursue a career that involves one of his interests. This would eventually lead him to become an author or a horticulturist.[16]

If all the rivals were in school in the same week, Osana would probably end up with Senpai.[17]

Raibaru Fumetsu

Main Article: Raibaru Fumetsu

Raibaru and Osana are best friends. They spend a lot of time with each other and never separate from one another. They are very close friends, even though they only met one year ago. Raibaru follows Osana everywhere and will instantly apprehend Ayano if the latter tries to murder Osana. As such, she will serve as a great obstacle for Ayano.[18]

Hanako Yamada

Main Article: Hanako Yamada

Osana, Senpai, and Hanako played together as children.[15] Osana might be the only person that Hanako would be willing to "give" Senpai since she wouldn't really look at Osana as competition, or a threat, or an enemy.

Hanako would be very sad if Osana died.[19]


Main Article: Info-chan

The second intro did not state why Info-chan is going against Osana. Info-chan simply wanted her to suffer, suggesting a negative relationship between the two.


Main Article: Suitors

In the future, Ayano can matchmake Osana with her suitor.


  • Osana's design was inspired by anime characters such as Asuka Langley Sohryu from Neon Genesis Evangelion and Rin Tohsaka from Fate/stay night. Her twin-tails and stockings, in particular, were inspired by Michiru Matsushima from The Fruit of Grisaia.
  • She is the second tsundere character to be introduced by YandereDev, the first being Tsundere-chan from Kuudere Simulator. YandereDev has said that Osana Najimi is "Tsundere-chan with an actual design that had effort put into it." [20]
  • Her voice actress, Brittany Lauda, voices Audrey Belrose, another tsundere, in the popular adult, dating simulation video game HuniePop.
    • Brittany Lauda was once asked to record more lines for a Senpai-Rival interaction event.[21]
  • At one point, YandereDev considered splitting Osana into two characters - a gentle childhood friend with Rival-chan's appearance, and a tsundere childhood friend. They wouldn't have been sisters, however, as that would mean eliminating one might affect the other so strongly that she couldn't consider dating.[22]
  • Her first name Osana (幼) means "Child", while her last name Najimi (なじみ) means "Friend" in English. Her first and last name osananajimi (幼なじみ) together mean "Childhood Friend" in English. The word Osananajimi is also a Japanese term for common trope in the romance genre, which is characterized by the fact that one or both childhood friends falls in love with the other. Another term for this common trope is Childhood Friend Romance.
    • There's also a Japanese name "Osana" (緒沙那), which consist of kanji 緒 (o) meaning "thread", 沙 (sa) meaning "sand" and 那 (na) meaning "what".[23]
  • For the character type which is Osana is the term Patient Childhood Love Interest.
  • YandereDev said on Twitter that Osana's birthday will be in January, most likely the 1st.[24]
  • Her "trademark" color is "probably" orange, but her favorite color is salmon or persimmon pinks, like her scrunchies and stockings.[25]
  • In the final game, Osana may tease Senpai about how he stands under the cherry blossoms all day, a reference to how long Rival-chan was under the cherry tree.[26]
  • Osana will perform the same "hip sway" animation as "Sansdere-chan" from Bad Time Mode.[27]
    • The animation can be found with the name "TsunIdle".
  • YandereDev said that the fastest possible way to put Osana into the game would be to take all of the code that applies to Kokona and point it at Osana.[28]
  • YandereDev had stated that in a few months, Osana will be added to the game to test out elimination methods that can only be used on "real" rivals.
  • In the October 16th update, it was possible to add Osana to the game by changing ID 33's name from "Unknown" to random words in the JSON file.
    • As of the January 3rd, 2017 Build, it is no longer possible to add Osana by editing the ID 33's in JSON files. Attempting to do so will trigger an Easter egg involving Fun Girl.
    • As of the August 18, 2018 build, her student ID has been changed to 11.
  • On the Yandere Simulator website in the FAQ, YandereDev said that Osana will be released in either late 2019 or early 2020.  In his "Light Music Club and Guidance Counselor in Yandere Simulator " video, YandereDev said that only a few things need to be added before Osana is implemented into the game.
  • If the player looks in the Student Info, Osana appears, but is named Reserved and has the Lovestruck persona.
  • As of an unknown build, if the student fills out the Student Info panel via debug commands, she will appear with her correct name. Her information will be “???”.
  • Osana's relationship with her parents is fine.[citation needed]
  • At one point in time, YandereDev had decided on a name for her cat but has now forgotten it.[citation needed]
  • She's 158.5 cm tall.[29]


N-no! W-why are you asking ME?! I-it's not like I like him or anything! I don't even NEED a Senpai! I wouldn't date YOUR Senpai! D-don't ask me any more questions! Baka!
— Osana talking to Ayano in "I Want My Senpai Back".
— Osana in "Raising the Strength Stat".
Did you oversleep again!? UGH! You ALWAYS keep me waiting! D-don't get the wrong idea! It's not like...I LIKE you, or anything! ...d...dummy...
— Osana in "Yandere Simulator Rival Introduction Video". [30]
Osana Rival Intro
Geez stop pushing yourself. You're going to get yourself hurt one day you idiot. D-don't get the wrong idea! It's not like...I LIKE you, or anything! ...d...dummy...
— Alternate Osana line for the "Rival Introduction Video".
Osana Rival Intro Alternate
Hello...? UGH! I told you to stop calling me, you creep! How many times do I have to say it? I'm! Not! Interested! If you don't stop bothering me, I'm gonna call the cops and- ...wait...what...? Are you...serious...?! Okay. Okay, Fine! I won't call the police. Look, this is a bad time for me. We'll talk about this later. Just...don't do anything rash, okay? ...ugh...why did something like this have to happen...
— Osana talking on the phone in "Mid-January Progress Report".[31]
I can't believe you overslept again! It's just like back in middle school! I'm not your personal alarm clock, you know!
— Osana in "Osana Progress Report and Mission Mode Update". [32]
Now that you mention it, yeah - there is something I need help with. I lost my phone charm - it's in the shape of a cat. I know that I lost it somewhere in the hedge maze - but I don't wanna go back in there. It's scary! I'm worried I'll get lost and be stuck in there for hours... I feel bad for asking, but... would you be willing to go into the hedge maze and get my phone charm for me?
— Osana asking Ayano to find her phone charm.
Really? You'll do it? You're a lot more brave than I am! Good luck!
— Accepting Osana's task.
Yeah, I don't blame you... I don't want to go anywhere near the hedge maze ever again...
— Denying Osana's task.
Oh my gosh! You actually found it! Wow - that's amazing! Thank you so much!
— Completing Osana's task.
Task Complete
Is this a bad idea? Maybe I shouldn't do this... what if he doesn't like it...?
— Osana in "January Osana Progress Report Part 1".
...r...really...? like it, Senpai...?...
...That's right! You SHOULD be grateful! But don't expect me to keep giving you free food!...u...unless you *want* to eat my cooking every day...
I...I didn't say anything! D...dummy!
— Osana in "January Osana Progress Report Part 1".
Bento Not Poisoned
Huh? What do you mean?
Hey! You shouldn't insult a girl's cooking, you dummy!
Huh?! Senpai, wait!...oh, no... what did I do wrong...?...
— Osana in "January Osana Progress Report Part 1".
Bento Poisoned
It's a bento, stupid!
D...don't get the wrong idea! I didn't make it for YOU! I just... made too much food this morning. So, you can have the extras!
Just...shut up and eat it!
— Osana in "January Osana Progress Report Part 2".
Huh? Baka!
— Osana in "January Osana Progress Report Part 2".
Uh, EXCUSE me? We're TRYING to have a PRIVATE conversation here! Never mind, Senpai...I'll talk to you later.
— Osana's un-implemented dialogue from the game files.[33]
Okay,'s can do this!
— Osana's un-implemented dialogue from the game files.[34]
Ugh, you can be such a pain, Senpai!
— Osana in "Kuudere Simulator 3".[35]
Just forget it, okay?! Anyway, I want you to meet me on the school rooftop at lunchtime! Got it?
— Osana in "Kuudere Simulator 3".
Ow! That hurts!
— Osana in "The Future of Yandere Simulator's Character Models".
So, Senpai, why do you spend so much time in the school plaza?
...I...I think the most soothing place is next to someone you care about...
...n-nothing. But, doesn't it get boring to spend most of your time sitting in one spot?
— Osana in "Osana & Organic Game Design".
Hey, Senpai - I want to show you something! Take a look!
What? What is it? What's wrong?
What are you talking about? Let me see.
What the...What is this?! How did this get on my phone?
Wait! I didn't take these pictures! I swear! You gotta believe me!
— Osana in "Osana & Organic Game Design". kept me dummy...listen up, okay? Because...I have something...really important to say... know...a lot of boys ask me to go out with them...but...I always turn them's not like I'm not like interested in boys...I just didn't feel like dating anyone...except for one person
...someone who's always been there, right next to me...up until now, I always thought of you as just a childhood was just trying to tell myself that, because I was afraid to admit my feelings...but...I finally realized...I can't keep lying to myself, and lying to you...I have to be honest with my feelings...this embarrassing, but...I can't stand just being friends anymore! Listen up, okay?! takes a lot of courage to say this! I...I love you, you idiot! Iloveyoumorethananythingelseintheworld!
...I...I don't get it...I should be so happy...but I can't stop crying... You're...being honest, right?
I'm...I'm so happy... Please...never leave big dummy...
— Osana confessing to Senpai and getting accepted.[36]
...wh...what...? this...because of the way I've treated you...?
I...I can...I can change... I, I can, I can stop...I, I can...!
— Osana confessing to Senpai and getting rejected.[36]
A flower? For me? Really? ...idiot! What a stupid gift! What do you expect me to do with this?! I'll put it in my hair for the rest of the day - but ONLY because I don't have anywhere else to put it! It's not like I WANTED a flower from you or anything! Baka!
— Hypothetical dialogue of Osana reacting to someone giving her a flower.[37]
"Huh? Ah - ah - ahh! AHH! AHHHH
— Osana being Drowned in the pool
..a little nap won't hurt... *yawn*...*snore*...
— Osana starting to sunbathe
It's tempting...I'm hungry...but it doesn't feel right. Maybe later?
— Osana refuse to accept salty snack from the vending machine if she was put in the game in April 2020 Builds.
I'm sorry, I don't know you well enough to do that...
— Attempt to follow Osana in May 2020 Builds if Osana was put in the game.
Whoa, that was close! Thanks for the heads-up, Raibaru!
— After Osana dodge buckets of gasoline.
I...well...yeah...I do have a problem, but...I'm not sure if you'd be able to help me... / A few days ago, in Shisuta Town, this weird guy approached me and started flirting with me... / He was really creepy and gross, and I wasn't interested in him at took forever to make him leave me alone... / The next day, I started getting text messages from him...even though I never gave him my phone number! / The worst part is, he keeps texting me pictures he's taken of's like he's just following me around snapping photos all day! / No! I can't do that! He told me that if I got to the police, he'll...he'll... / I...I don't wanna tell you, but...calling the police is not an option! / No, it's nothing like that... / What...? No! I don't want you to get involved! Look, I appreciate your concern, but...please...just...let me deal with this myself.
— Osana during her conversation with Raibaru on the rooftop.




  2. 4242816
  13. ↑ 22.0 22.1
  15. 15.0 15.1
  33. Ayano_Caught.png
  34. Osana_Bento.png
  36. 36.0 36.1

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