Chizuru Hishiro

Hishiro Chizuru 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 Chizuru 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. 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.

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.

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. After interacting with Kaizaki, she has fallen in love with him, although she is in denial of her own feelings.She wants herself and Kariu to be wary of Onoya An whom she thinks is very close with Kaizaki and Ohga.

Yoake Ryo - She has a close relationship with Yoake 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, but Hishiro's smile looks like a smirk to Rena creating a lot of misunderstanding. After some time they become friends and eat lunch together.

Honoka Tamarai - Hishiro becomes friends with Tamarai through Rena.