Osana Najimi
Student Info
Role Rival,
Senpai's Childhood Friend
Class 2-1
Club No Club[1]
Age 17
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 student at Akademi High. She will be used as a tutorial at the beginning of the full game.[6]

YandereDev needs to complete very few key game features before implementing her into the game.



Rival-chan near a tree

Original Osana.

Osana's original look was Raibaru Fumetsu's current appearance. She had light orange eyes and her hair tied up in two short golden-orange pigtails. Osana's 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's current appearance has long, orange twin-tails that reach her knees. The ends of her hair fade into a small yellow gradient. Her hair is tied up in thin salmon pink scrunchies with white polka dots, and matching stockings. Her shoes are black and she wears a small red bow on the right side of her head. She has a bust size of 1.

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.[7] 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 she is afraid of letting him know how she truly feels about him.

She doesn't want him to know how she really 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."[8]



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 silouhette.  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 that she is hostile and cold towards someone she likes before warming up and becoming sweeter to a person eventually. However, she is not shown to be like this towards Ayano, even acting nice to her when she completes her task. Regardless of Osana's rudeness and Senpai's ignorance, Osana is still very considerate. She seems to be much nicer to girls and her other friends. She is implied to be a popular student, as she‘s seen sunbathing with 6 other girls and she herself says that many boys ask her out.


Though it is unknown at the moment, YandereDev has said that her routine will put her in close proximity to Senpai or other students.[9]

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 she 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, she 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, she will socialize with Raibaru every day, and will not take her phone call, nor will she patrol clubrooms.


The topics towards Osana Najimi is Negative/Neutral/Positive follows:


  • Drama
  • Occult
  • Science
  • Gaming
  • Anime
  • Cosplay
  • Violence


  • Cooking
  • Light Music
  • Sports
  • Gardening


  • Everything else.



Main Article: Senpai

Osana and Senpai are very close, they are childhood friends and regularly spend time together, meeting overs together in the morning every day, Osana has a crush on him but he is oblivious, as a result, she tries to impress him in the days leading up to her confession.

Osana, Senpai, and Hanako all played together when they were younger.[10] Osana has a crush on him, although he does not seem to be aware of it.

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 horticulturalist.[11]


Main Article: Info-chan

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

Hanako Yamada

Main Article: Hanako Yamada

Osana, Senpai, and Hanako played together as children.[10]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.[12]


Main Article: Suitors

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

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. Raibaru follows Osana everywhere and will instantly apprehend Ayano if the latter tries to murder Osana. As such, Raibaru will serve as a great obstacle for Ayano.[13]


  • Her name osana (幼) means "young child", while her surname najimi (なじみ) means "old friend" in English. Her name and surname 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, that is characterized by the fact that one of both childhood friends falls in love in the other. Another term for this common trope is Childhood Friend Romance and for the character type which is Osana is the term Patient Childhood Love Interest.
  • 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.[14]
  • YandereDev said on Twitter that Osana's birthday will be in January, most likely the 1st.[15]
  • Osana will perform the same "hip sway" animation as "Sansdere-chan" from Bad Time Mode.[16]
    • The animation can be found with the name "TsunIdle".
  • 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." [17]
  • 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.[18]
  • Her voice actress, Brittany Lauda, voices Audrey Belrose, another tsundere, in the popular adult, dating simulation videogame HuniePop.
    • Brittany Lauda was once asked to record more lines for a Senpai-Rival interaction event.[19]
  • Osana's design was inspired by anime characters such as Asuka Langley Sohryu from Neon Genesis Evangelion, Rin Tosaka from Fate/stay night, and her twintails and stockings were inspired by Michiru Matsushima from The Fruit of Grisaia.[20]
  • 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.
  • 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.[21]
  • In the October 16th update, it is 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.
  • Osana is an only child.[22]
  • She and Senpai attended the same middle school.[23]
  • Her "trademark" color is "probably" orange, but her favorite color is pink.[24]
  • If all the rivals were in school in the same week, Osana would probably end up with Senpai.[25]
  • YandereDev doesn't imagine her mother to be tsundere.[26]
  • On the Yandere Simulator Webpage 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.


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". [27]
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".[28]
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". [29]
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.[30]
Okay,'s can do this!
— Osana's un-implemented dialogue from the game files.[31]
Ugh, you can be such a pain, Senpai!
— Osana in "Kuudere Simulator 3".[32]
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.[33]
...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.[33]
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.[34]




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  10. 10.0 10.1
  30. Ayano_Caught.png
  31. Osana_Bento.png
  33. 33.0 33.1

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