Chizuru Hishiro

Chizuru Hishiro is a third year student at Aoba High School, the school Kaizaki attends after he became a teenager. She is Subject No. 001 of the ReLife lab in the Kanto Region.

Post ReLife
She is slender, young girl with black hair and light green eyes. She wears the 3rd year uniform with a red lapel that all third years wear. She also has a silver lapel pin after becoming the Student Representative.

Pre ReLife
Pre Relife, Hishiro looks very similar to how she looks post ReLife, the only difference being that she has longer hair with locks reaching her chin with her eyes being partially hidden by her locks. She is taller than her Post-ReLife self and is seen wearing a formal business suit.

History
Hishiro used to transfer schools a lot during her childhood, which resulted in her not being able to make proper friends. She graduated from a decent university with excellent results and got placed in a big company. Due to her childhood experiences, she avoided human contact and her communication skills became non-existent. She quit her jobs subsequently and pushed away people. She met Yoake Ryo after one of her failed interviews and was asked to become Relife Subject No. 001 in the Kanto Region. She then underwent the ReLife process.

Hishiro then was made to enter Aoba High School as a second year student along with Ryo.In order to improve her interpersonal skills and regain her feelings damaged in the past, Hishiro was put in a class with a bullied student.The plan was to make her help that student and thus make a friend. Also, it was expected for her to form a romantic relationship with Ryo. Hishiro still remained indifferent to everything and she showed no change.

Ryo was then criticized for not lending proper support, so he got more involved and asked Hishiro to help out the bullied student.This resulted in a disaster, however, and the student was bullied even more because of Hishiro's clumsy way of trying to stop the bullying. After that incident, she totally avoided total human contact and Ryo was once again criticized for interfering too much in her experiment.

Hishiro's ReLife experiment emphasized her desire for isolation.Ryo approached her frequently to know if she had issues. As she was asked not to rely too much on the ReLife Staff, she denied his help. She just concentrated on the education part and totally neglected improving interpersonal relations.

After a while, Ryo informs that her ReLife experiment had been deemed a failure and that she could not get a job because of that. She then admits that she did not take any efforts to change herself and only concentrated on her studies. Ryo then asks her to indulge in another year of ReLife experiment and promises she'll succeed in it.

Hishiro then styles her hair so that she looks the part of a high schooler. She then meets Ryo and tells him she'll engage in another year of the ReLife experiment.After this, she was put in the third year in Aoba High School along with Kaizaki and has changed due to his influence.

Personality
Kaizaki notes she has a clever,smart atmosphere to her. Hishiro is highly intelligent, always seen getting the first place in any exam. Despite her intelligence, she is highly oblivious of her surroundings and people's feelings, openly voicing out insults, such as when she first talked to Kaizaki. She has a habit of people by names like calling Kaizaki "The Cigarette Guy" and Kariu as "The Red Haired Girl who did 7.38 seconds" because she does not know the name of other students in her class. She also does not know how to smile properly, often giving a forced smile that often makes people around her not take it in a friendly way. She wants to get people more and make friends as she has reached the final year of school. She often searches the Internet about things she does not understand and tries to follow the tips given there.

Summer Vacation Arc
Hishiro is seen attending supplementary lessons during the summer vacation. She's then seen in the group when Ohga decides to confess his feelings to Kariu. She tells she's not experienced in those matters when consulted by Ohga. She also feels irritated after hearing that Kaizaki is super experienced with women.She is later asked by Arata not to tell Kariu about Ohga's plans of confessing.

After Kariu decides to confess to Ohga, she goes Yukata shopping with her,Tamarai and Onoya. She's greatly confused as to which type of Yukata she should select as it is new for her. She then selects a Yukata based on Onoya's advice.

During the festival, she apologizes to everyone after she arrives 3 minutes late.She faces difficulties in getting around and after Yoake offers her to take his arm, she gets around with his help. During the fireworks, Kaizaki sits along with her when she tells Kaizaki that he's able to make friends quickly and feels elated when he tells she has a lot of friends as well.

She then tells that she's glad she met Kaizaki and then feels distressed that he would be separated from her after high school. After the fireworks, she asks Yoake to accompany her home, greatly shocking Kaizaki and Rena. Yoake then says he'll accompany Onoya and asks Kaizaki to take Hishiro home.

She asks Kaizaki to spend some time with her to witness Kariu and Ohga's confessions. She says she's poor in understanding things about love and friendship and wants to get a clear picture after seeing the confession.She then tells Kaizaki that even though she thought that Kariu confessing to Ohga was useless, she feels happy for them. She tells that she is still not clear about her feelings and Kaizaki asks her to make a lot of friends and find romance.

ReLIFE Support Transfer Arc
She is seen at a restaurant along with Honoka and Kariu,congratulating the latter after she tells about her successful confession. Hishiro then tells Ohga was planning to confess as well, then stops herself from telling further about it. She then tells Kariu that she was watching her confession to understand about feelings. She then leaves the shop and asks Yoake to meet her and asks him whether Kaizaki is a ReLife Experiment subject.

Hishiro then tells Ryo why she thinks Kaizaki is an adult because of the things she observed about his lifestyle and behaviour. She then remarks that with how stupid Kaizaki is,she finds it hard to believe he is an adult. Ryo then tells Hishiro to ask Kaizaki directly if she wants to know if he is a ReLife experiment. As the ReLife experiment will be terminated if people come to know about it,this will cause Kaizaki's experiment to be terminated and he will lose memories of Hishiro, which shocks her greatly. Hishiro is then complimented by Ryo that she has started caring about others and that she smiles more, and wished he could see more of her progress.However as her second term supervisor would not be him, he regrets not being able to view her progress further. He then asks the new supervisor to show themselves. Onoya then greets Hishiro saying she'll be her new supervisor, which burns Hishiro's brain.

Hishiro is seen with Onoya and Ryo complaining about having to skip her supplementary classes. She then tells them she would rather cut her classes than continue their conversation. She then tells that she thought Ryo was the kind of person to go out with Onoya and that he was a creep.She then tells that going out with a guy 11 years younger was strange remembering her earlier discussion with Ryo. Hishiro then bluntly asks whether Ryo has been fired from his job and will be a NEET. She then bombards Ryo with questions to see whether he'll let anything slip about Kaizaki and compliments his guard being solid.

She refuses to believe Ryo when he says that she's wrong about Kaizaki being an adult. Onoya then asks Hishiro why she is so concerned about this. She asks Hishiro if she is just curious and if she started having this feeling after seeing Onoya get close to Kaizaki. Onoya then asks if Hishiro expects Kaizaki to be an adult, so that she would no longer need to suppress her love for him. Onoya then expresses that it would be interesting to monitor Hishiro, earning an intimidating glare from the latter.

Relationships
Kaizaki Arata - Kaizaki was the first friend Hishiro made. He helped her out during the first day by loaning her lunch money. She comically asked him for his number by asking for his phone. He was the only person around whom she first gave a proper smile and was her first true friend. After interacting with Kaizaki, she has fallen in love with him, although she is in denial of her own feelings.

Yoake Ryo - He was Hishiro's supervisor in the previous year and in the beginning of the current year. She has a close relationship with him as she calls him by his first name, Ryo. During the summer festival, she held his hand to get around and later asked him to take her home. This act greatly shocked Kaizaki to the point that he thinks she likes him.

Kariu Rena - Rena considers Hishiro a rival in academics. Hishiro tries to become Rena's friend by smiling at her when their eyes meet, but Hishiro's smile looking like a smirk to Rena creates a misunderstanding. After some time, due to Kaizaki's help they become friends and eat lunch together. She is considered to be one of her close friends as she discusses about confessing her feelings for Ohga with her.

Honoka Tamarai - Hishiro becomes friends with Tamarai through Rena.She calls her by the nickname "Hishiron". Hishiro helps Rena mend her relationship with Honoka during the Volleyball Tournament after their tiff, earning the gratitude of both.

Onoya An - She's greatly disliked by Hishiro, mostly because of how close she gets with Kaizaki. She asks Kariu to be wary of her because she's close with Ohga as well. During the second term of her final year, she becomes Hishiro's current supervisor.

Trivia

 * Her favorite food seems to be Ramen,as she is snacking on it during lunch.
 * She frequently changed schools during her childhood, resulting in her lack of friends and interpersonal skills.