|Club|| Cooking (since 11/15/2015)|
Sports (5/24/2015 – 11/1/2015)
|Persona|| Social Butterfly (since 2/1/2016)|
Loner (2/1/2015 – 1/15/2016)
|Crush||Senpai (since 9/1/2015)|
|Appears||Week 1 (Debug)|
Before the February 8th, 2016 Build, she had purple colored hair worn in two drill pigtails. Her eyes were light purple as well.
As of the February 8th, 2016 Build, she has light purple spiky bangs which sweep to the right of her face and twindrills. She has dark purple eyes, fair skin and a very large bust size, set at 2.
As of the September 22nd, 2016 build, Kokona wears purple stockings and panties.
As of the January 16th, 2017 Build, Kokona wears a purple friendship bracelet on her right wrist.
Among the personas currently implemented in the game, she is a Social Butterfly. She will happily pose for a picture if the player aims their camera at her. If she sees a corpse or witnesses a murder, she will run to the nearest secluded area and call the police. She cannot participate in physical fights against murderers.
According to her Student Profile, Kokona may be participating in compensated dating (also known as Enjo kōsai) and may be a victim of domestic abuse, though the latter is proven false as of the June 1st Build. Although she does not enjoy it, Kokona only engages in such an activity to try and help her father out of debt.
In one of Druelbozo's streams, he explains that Kokona tries hard to become popular, but she is constantly bullied.
At 7:04 AM, Kokona enters the school grounds. She walks to her locker at 7:06 AM and changes from her outdoor shoes to her indoor shoes. At 7:15 AM, she walks into the plaza, to the left side of the fountain, and gossips with Yui Rio, Yuna Hina, Koharu Hinata, Mei Mio, Saki Miyu, and Musume Ronshaku. On Monday, at 7:45 AM, Kokona receives a call from a mysterious stranger and runs to the doorway in front of the lockers furthest to the right when facing the school.
On Wednesday, at 7:30 AM, Kokona goes to the girls' bathroom on the first floor. On Thursday, at 7:15 AM, she goes to the shower room to take a shower and leaves her phone inside her locker, which the player can steal.
At 8:00 AM, Kokona walks into Classroom 3-2 and sits at her desk. She starts her morning classes at 8:30 AM, and leaves the classroom at 1:00 PM. On Monday, she goes to the rooftop to talk with Saki about what is vaguely hinted to be domestic abuse. On Wednesday, Kokona stays in the classroom until 1:03, when she walks down to the plaza with her lunch. Once she arrives at 1:07, she places her lunch down on a bench and goes to hide behind a tree to admire Senpai. On all other days, she goes to the cafeteria to gossip.
Kokona walks back to class again at 1:30 PM and finishes her afternoon classes at 3:30 PM. She then heads to the Cooking Club and stays there until 5:00 PM. On Monday and Thursday, she makes octopus-shaped hot dogs and shares them with the other members. On all other days, she sits at the table like the other members. Afterwards, Kokona heads to her locker and changes from her indoor shoes to her outdoor shoes, then she lingers there until 5:15 PM, when she walks home.
When Kokona was younger, she was a normal cute baby with the potential to become anything she wanted to, just like any other.
It is assumed in a conversation between her and Saki Miyu on the rooftop that she has been abused by her drunk father after her mother's death. This is actually incorrect. When spoken to more, Kokona will talk about how her father comes to her to cry about his debt problems. Her family is very broke due to a loan he took out to pay for Kokona's school tuition, accidentally becoming in debt with a group of loan sharks, called Ronshaku Loans.
Kokona Haruka is also involved in compensated dating with a person who she has seen at least once in Shisuta Town. He might have offered her a large sum of money to meet him. If Kokona's dark secret is bought, Yandere-chan will receive video footage of Kokona selling used panties to a boy from another school that can be used as blackmail. Kokona does this to pay for her father's debts.
- Main Article: Tasks
Kokona will have a uniform that is too tight around the chest. She will ask the player to get her a new one. To achieve this, the player has to buy a clean uniform from the drops menu, and then take the uniform to the sewing room and alter it. She will thank the player after the new, altered uniform has been given.
- Main Article: Saki Miyu
Kokona is seemingly good friends with Saki, and almost opens up to her about her father's debt problems. According to Saki's Student Profile, Kokona is willing to tell Saki about personal matters, but not too much.
However, if Saki learns about Kokona's compensated dating, she will be distraught and won't do anything to help Kokona out. In the full game, Saki might have comforting animations for Kokona, but will avoid her if it really gets too bad.
Saki Miyu will not be Kokona's senpai, as they are just friends.
It is revealed that Kokona had Saki involved in her plans for her father to get out of debt, though regrets having Saki help her, as Saki planned to sell her underpants to boys from other schools, but was too embarrassed to carry it out. This sets up Saki's task for Yandere-chan to find her bra somewhere at school.
- Main Article: Senpai
Since she is a test rival, she has a crush on him. Kokona calls him "Senpai", even though they're in the same class. She might also be moved to either Class 2-1 or Class 2-2 so that she can still call her crush "Senpai". Currently, the only event that shows her feelings is her Wednesday speech, where she hides behind the tree and speaks while staring at Senpai. This event can be used as an opportunity to poison Kokona's bento.
- Main Article: Riku Soma
When the November 15th, 2015 Build came out, YandereDev stated that Kokona's second crush is one of the students who already attends school. As of the 22nd of September, 2016 Build, Yandere-chan can matchmake Kokona with her suitor, Riku Soma.
The topics that Kokona likes and dislikes are as follows:
- Cooking - View Kokona preparing octopus-shaped hotdogs in the Cooking Club.
- Cats - Make Kokona follow the player near the kitten.
- Friends - Listen in on Kokona's and Saki's conversation.
- Family - Offer to help/listen to Kokona explain about her and her dad's situation.
- Money - Listen to Kokona's compensated dating phone call.
- Occult - Have Kokona follow the player into the Occult Club.
- Solitude - Walk into the group of girls in the plaza in the morning or the Cafeteria during lunch.
- Violence - Take Kokona near the ritual knife in the Occult Club.
- Video Games - Take Kokona near Pippi Osu or Ryuto Ippongo while they are playing in the computer lab.
- Gossip - Use the "Gossip" option in conversation with Kokona.
- Drama - Take Kokona past the Drama Club.
- If Senpai is not at school on Wednesday when Kokona goes down to the plaza to eat, she will walk in place.
- In the January 3rd, 2017 Build, when Kokona goes to eat her lunch by the fountain on Wednesday, her event will still play out, even though Senpai has been moved to the rooftop.
- Many fans link Kokona's appearance to Teto Kasane the UTAUloid. However, YandereDev did not intentionally make Kokona look like Teto. It was pure coincidence.
- Her hairstyle is final. 
- Her name is a reference to the eleventh and twelfth most popular female Japanese names in 2012, 11th most popular being Kokona, 12th most popular being Haruka.
- YandereDev uses her character to test the new elimination methods every new update, as he has shown in his tutorial videos. When asked about the reason for this, he stated that somebody had to be the guinea pig and she was simply unfortunate enough to be the one picked.
- In older versions of the game, Kokona Haruka's name was Nodo Mana. The placeholder name was inspired by K-On!.
- YandereDev is not sure where Kokona lives at the moment.
- YandereDev nicknames Kokona as "Everyone's favorite punching bag", referring to how she can be killed in more ways than any other student. The main reason why it is so easy to kill her is because YandereDev needs to test killing methods quickly for the sake of debugging the game.
- Kokona succeeds Victim-chan as the test rival.
- Her male counterpart is Riku Soma.
- Before the June 29th, 2016 Build, Kokona used to arrive on school grounds 7th in line on the left side, at 7:05 AM.
- In the September 18th, 2015 Build, her crush was set to "None" by mistake.
- Kokona makes a small cameo in the Gaming Club by appearing on the racing game, racing against Saki.
- Her cell phone is the same purple color as her hair. 
- Pressing "G" on the debug menu will cause her and Yandere-chan to teleport to the rooftop, where the player can push her off or offer help.
- Kokona finds slicked back hair, purple hair, glasses, piercings, and intelligence attractive in a guy.
- As part of the final game, Kokona may be a member of the Drama Club and would serve as a tutorial to Yandere-chan on various game mechanics. She would do this by acting out various features, such as performing attacks and dropping items.
- Kokona was the first in the rainbow six to get colored stockings and panties.
|“||Oh! There he is! Oh, Senpai...when will you notice how I feel about you? Okay, I've made up my mind... I'll tell him how I feel this Friday! I hope he accepts my feelings...||”|
— Kokona talking to herself about Senpai on Wednesday at lunchtime.
|“||Sorry, my phone's ringing! I'll be right back.||”|
— Kokona when recieving a phone call at 7:45 AM on Monday.
|“|| Oh...well...it's it's nothing...
I...I guess there's one thing I want to talk about...
Ever since my mom died, my dad's been drinking a lot. Sometimes, when he's drunk, he comes into my room, and... ugh! Forget I said anything. I really, really, don't want to talk about it.
Look, I said I don't want to talk about it. Just leave me alone, okay?
I'm not gonna say anything else... please, just drop it...
— Kokona during her rooftop encounter with Saki on Monday during lunchtime.
|“||Hello? Ugh- I told you not to call me when I'm at school! Like I said, that was a one-time thing! I don't wanna do that again! ...h-how much did you say...? Well... if it's just one more time, then... I guess it's okay... how about tonight? Where we met last time, in Shisuta Town? Okay then... see you tonight. Ugh! I can't believe I'm doing this.||”|
— Kokona talking to an unknown person on Monday at 7:45 AM.
|“||Kyaaaa! Did someone really just throw water on me? Why would someone do this?!||”|
— Kokona after Yandere-chan pours water on her.
|“||Kyaaaa! Ugh, seriously?! Be more careful!||”|
— Kokona after Yandere-chan trips and splashes water on her.
|“||Kyaaaa! What is this?! Is this blood?! Where did all this blood come from?!||”|
— Kokona after Yandere-chan pours blood on her.
|“||Kyaaaa! What is this?! It smells like... gasoline?||”|
— Kokona after Yandere-chan pours gasoline on her.
|“||I can't go to class like this! I need to go wash this off!||”|
— Kokona after blood or gasoline is dumped on her by Yandere-chan.
|“||I can't go to class like this! I need to change my clothes.||”|
— Kokona after water is dumped on her.
|“||Someone threw blood on you too? Who is doing this?||”|
— Kokona noticing Yandere-chan covered in blood while she is covered in blood as well.
|“||Hey! Don't turn off the lights!/No! Turn the lights back on!/Stop! There's someone in here!||”|
— Kokona after the lights are turned off while she is using the toilet.
|“||Ugh! I have to turn the stupid lights back on... Where is it?||”|
— Kokona while trying to turn on the lights if the player turned them off.
|“||No, I haven't seen your Senpai.||”|
— Kokona in "I Want My Senpai Back"
|“||Hey! What are you--||”|
— Kokona before being drowned.
|“||It... it's not what you think... I was just... um...||”|
— Kokona trying to defend herself after being scolded by the counselor for her dirty secret.
|“||No! I'm not the one who did this! I would never steal from anyone!||”|
— Kokona trying to defend herself after being framed for theft.
|“||Huh? I don't smoke! I don't know why something like this was in my bag!||”|
— Kokona trying to defend herself after being framed for smoking.
|“||Where's my phone? Did I drop it somewhere? I hope it wasn't stolen...||”|
— Kokona noticing that her phone disappeared.
|“||Oh, my phone! How did it get here...?||”|
— Kokona finding her phone.
|“||What?! I've never taken any pictures like that! How did this get on my phone?!||”|
— Kokona trying to defend herself after being framed for panty shots.
|“||What? Wait, no! I don't know how that got there!||”|
— Kokona defending herself after being accused of cheating.
|“||No! Please! Don't do this!||”|
— Kokona imploring the counselor not to expel her.
|“||Ugh...My uniform doesn't fit...It's too tight around the chest..I want to get a new uniform, but...I can't afford one right now...Oh...! I guess there's no point in complaining..It's not like there's anything you can do...||”|
— Kokona asking for a new uniform.
|“||You'll get me a new uniform? Really? I would love that!||”|
— After accepting her task.
|“||... sorry for whining about my problems...||”|
— After denying her task.
|“||No way! This uniform is tailored to my exact measurements! Now I'll finally be comfortable! Thank you so much!||”|
— After completing her task.
|“|| Oh! You're the one who wanted to meet me here? Your note said that you wanted to talk about...domestic abuse?|
Oh...you've got it wrong! My father doesn't do anything to me!
He cries...and talks about his debt problems...
When my mom died last year, my family lost a lot of money...my dad took out a loan so that he could continue to pay for my tuition fees...but...It turns out that he borrowed money from some really shady people...they raise the interest rate by 10% every ten days...and they threaten to get violent with him if he doesn't pay up...
I'm trying to help my dad get out of debt...I'm trying to earn money any way I can, but...the only ways to make money fast are...gross...
Um...I think it's called...Ronshaku Loans.
What? No! Please don't get involved. I doubt there's anything you could do about it...
I appreciate your concern...but I don't think there's anything else to be said...thanks for letting me talk about my problems...
— Kokona's conversation with Yandere-chan at the rooftop.
|“|| My dad just got a phone call...he says his debts have been wiped clean!|
Did...you do this?
What did you do?!
That's...kind of scary...but, I can't remember the last time I saw my dad this happy!
I don't know what you did...and I'm...afraid to ask...but you saved my dad! Thank you so much!
Words can't express how grateful I am! If there's anything you need me to do for you, just say the word!
What is it?
I'll be there! And, one last time...thank you!
— Kokona's text conversation with Yandere-chan.
|“|| You have a nice place, Yan-chan!|
Where are your parents?
So, you take care of yourself? That must be hard.
I want to thank you again for helping my dad. I won't ask what you did. I'm sure it's something you wouldn't want to talk about...But I hope you gave him what he deserved! Loan sharks are awful people...I did a bunch of stupid things while I was trying to make money, but my biggest regret was getting Saki involved. I never told her about my dad's debt, but I did tell her that I needed money fast. She tried to help me out by selling her underwear to some boys outside of school. In the end she couldn't go through with it, so instead of selling her bra, she threw it over the school wall! I wonder if she ever found it...That must have been so embarrassing for her...I feel so bad about it..but now it's all in the past. You saved my dad, and now I can finally stop spending my time trying to make money in gross ways! Oh! I just realised I've been rambling this entire time. You said you had something important to tell me, right?
...oh...you know about that...?...what did you want to say about him...?
...I...have...really strong feelings for that boy...I don't want to lose him...but...I could never take someone away from you, after everything you've done for me...okay...I'll stay away from him.
...but...you'd better take really good care of him...okay?
— Kokona's conversation with Yandere-chan at her house.
|“||Wait, what are you doing?! That's not funny! Stop! Let me go! ...n...NO!!!||”|
— When Kokona is eliminated at Yandere-chan's house.
|“||We definitely have the same opinion.||”|
— When Riku makes a positive remark in about something Kokona likes with very low affection.
|“||Right! I couldn’t have said it better myself.||”|
— When Riku makes a positive remark about something Kokona likes with low affection.
|“||Y...you really think so...? ...nobody’s ever called me that before||”|
— When Riku tells Kokona that she looks cute with low affection.
|“||Cool. Not many people are aware of that.||”|
— When Riku displays wisdom to Kokona with very low affection.
|“||Wow! You're very well-informed!||”|
— When Riku displays wisdom to Kokona with low affection.
|“||You could be a professor and teach a class about this!||”|
— When Riku displays wisdom to Kokona with medium affection.
|“||How do you remember so much information? You're a genius!||”|
— When Riku displays wisdom to Kokona with high affection.
|“||Uh... well... bye, I guess...||”|
— When Riku leaves Kokona with no affection.
|“||See you later||”|
— When Riku leaves Kokona with very low affection.
|“||I hope I see you around later||”|
— When Riku leaves Kokona with low affection.
|“||Hey! Just so you know, I take offense to that...||”|
— When Riku makes a negative remark about something Kokona likes.
|“||To be honest with you I strongly disagree...||”|
— When Riku makes a positive remark about something Kokona dislikes.
|“||Ugh... how many times will I have to hear people say that... do people really think that’s a compliment?||”|
— When Riku tells Kokona that she looks sexy.
|“||Uh... well... go tell someone who has twin-tails, then...||”|
— When Riku tells Kokona that he likes twin-tails.
|“||...everytime I've tried to make cupcakes, I’ve ruined them somehow.||”|
— When Riku tells Kokona that he likes cupcakes.
|“||...wh...what?! Don’t ever talk about my undergarments again! Hmph…||”|
— When Riku tells Kokona that her panties suit her.