Onii-san

Onii-san (or "Mister" in some translations) is one of the main characters of the story. His name is unknown at the beginning of the story as he never formally introduces himself to Sachi, so she just calls him "Onii-san". He has light-colored hair and always wears a face mask.

At the beginning of the story, Onii-san has kidnapped XXX-san, but to his surprise, she is not only willing to go home with him, but she is also happy to do so. Once at home, she tells him that he's rescued her from her abusive parents and bullying schoolmates. He names her "Sachi" to replace her old name attached to her former life of bullying and abuse. He has mixed feelings about this situation because although he has been stalking her and has a massive collection of photos of her he has secretly taken, Onii-san knows he is a criminal. Moreover, he is uncertain of how genuine her feelings are about being kidnapped.

Sachi proposes that they turn their situation into a game. If they can escape the police and her parents they can get married. But if they get caught by her parents or the police, they will die together. He hesitantly agrees.

## Appearance

Onii-san is a male of average height and builds with white hair and blue eyes. At the beginning of the story, he is always wearing a face mask, so his face is never revealed. He was noted by Miho Satou to be rather good-looking and mysterious.

## Personality

On the surface, Onii-san seems like a regular guy. He is calm, knowledgeable, and protective of Sachi. Inside, however, he is nervous and doubtful. He regularly worries about getting caught, and it's stated in the manga that he’s constantly changing identities as he reveals a drawer full of hundreds of IDs. He wonders whether Sachi is being truthful about being happy with the situation. Plus, in the beginning, he has no 'end game' — he was obsessed with her and brought her home with him unexpectedly, so he didn't know what to do with her once he had her.

## History

As of Chapter 42, very little is known about Onii-san. We know that he is an orphan and that a man, who has yet to be named, raised him like a parent. The death of this person a few years before the start of the manga is what drove Onii-san into a deep depression, which in turn triggered his stalking and eventual kidnapping of Sachi. The death of this man is also the reason why Onii-san dislikes sunsets because his father-figure died on a day that had a beautiful sunset.

## Story

### Before the kidnapping.

One day, Onii-san, a man most likely in his early-mid 20s, was walking home from working as a day laborer. He was listening to music on his phone but was lost in depressing thoughts. He didn't know why he was bothering to work anymore. The reason he had a normal existence was a father-figure in his life who was no longer there. He had died a few years ago, on a day with a beautiful sunset. Onii-san wondered if he should commit suicide because of his pointless existence.

Onii-san was still walking when he looked up and saw a young teenage girl. She had a very blank look in her eyes as she walked through the crowd. Suddenly, a girl runs from behind the girl and pushes her aside to get to her friends. The girl bumped into Onii-san, causing him to drop his cellphone at her feet. Instead of picking up the phone, the young girl dusts herself off and continues on her way. Onii-san is annoyed that the girl never acknowledged him and that his phone cracked because of her running into him.

A bit later, while continuing to walk home, he saw two girls harassing the same girl who ran into him earlier. One of the girls splashed water on her and kicked her to the ground. Onii-san was surprised to see the mysterious girl again. She still had a very blank look on her face, as if she'd given up hope on life. He took a picture of her for no reason and went home.

When he got home, he thought about how he hated the teenager for her indifference to being mistreated. Over time, he also realized that the more he thought about her, the more he stopped thinking about his own depression and thoughts of suicide. He eventually makes a photo print of the girl and tapes it on the wall next to a picture of a sunset. He did this because he hated both the sunset and the girl and hoped that over time he wouldn't care about either of them anymore.

However, the opposite happened with the girl, and he became obsessed with her. He followed her around without her knowing it and took pictures of her with his phone. His fascination with her had not gone away. His actions had escalated into stalking. He even bought a proper camera to take pictures of her.

### The Kidnapping.

Onii-san followed XXX-chan around until one day when she returned home after school around 6 pm, her front door was locked. She sat on the porch, and Onii-san went home. Overwhelmed by curiosity four hours later, Onii-san went back to the girl's house and saw that she was still sitting outside, at ten o'clock pm. He watched as the girl stood up, dumped the contents of her school bag onto the floor, and walked away. He followed her to a riverbank, where she found a stray kitten. He watches as she picks it up and tells it that she's finally going to do all of the things she's wanted to do, like window shop. And then, after three days, she's going to kill herself. Onii-san is shocked by this because he too wants to die, to end his loneliness. But he is too afraid to kill himself. So he decides to follow her around to see if she actually does it.

But in less than three days, after watching her fail to enjoy her new-found freedom, she returns to the river bank. The same kitten is still there, and she lifts it again and tells it that she didn't enjoy herself like she wanted to. So instead of killing herself while she's had fun, she's going to kill herself because she didn't have fun. But at least it's her choice to do so.

Onii-san said to himself that he would not interfere, but the sight of somebody, especially somebody he both hates and is fascinated with, about to kill themselves is too much. Before the girl can jump into the river, he grabs her arm. When she questions him, he tells her that he's been stalking her, and cannot let her die. He tells her he's taking her home with him and is surprised by how happy the girl is to be kidnapped. She says he's taking her away from her horrible life since he knows what she's been going through. He disagrees, but eventually lies and says that he loves her, and won't do anything to hurt her. He does not want to hurt her, but he doesn't love her.

### Life With "Sachi"

Onii-san adjusts to living with Sachi. They cook together and go on a date. When a man posts videos online saying that he's XXX-chan's real kidnapper, and Sachi goes alone to meet him, Onii-san rescues her.

### On the Run

Onii-san realized it was time to leave Tokyo after the business with Katagiri was over.

## Relationships

### Sachi

Sachi is the girl Onii-san stalked before kidnapping her.

He began stalking her out of hatred. She reminded him of the past and especially his past self. He takes photos every time he finds something to hate saying that if he stares at it enough, he'll forget how much it irritated him. Soon it escalated to the point where his whole room was covered in pictures of her and the feeling never faded. Sachi embodies what he couldn't have done. Escape his own hell or kill himself. He's envious that she's more than he'll ever be. He wants to use her for his own intentions of projecting his own self-hatred onto her, silently hoping she doesn't have the guts to do what he couldn't, kill herself.

When he realizes Sachi is gonna genuinely kill herself, he disrupts her. There was no intention of saving her, it was just the same sunset he's seen someone die in front of before. He tells her everything and that he's gonna kidnap her in hopes of being rejected so he'll stop having this feeling and projecting himself onto her can cease. This doesn't happen. He sees her willingly coming with him as her failed suicide attempt, finally giving him some satisfaction. He then begins to cling to her, realizing he lives to keep her alive and dragging her down with him, using what they've made as his own happiness. He lives for her sake.

When he realizes that he **willingly** saved her from Shin Katagiri, he can't find the answer why.

### Shin Katagiri

Onii-san rescues Sachi from Katagiri, her former teacher, while he was at work. Katagiri was posing as Sachi's true kidnapper in order to bait her into meeting with him.

### Miho Satou

Miho is a young college student that briefly worked with Onii-san while he and Sachi lived in Tokyo. She has a strong crush on him, but he  doesn't acknowledge her beyond being a coworker. He advises her not to get involved with him, and her infatuation with him causes him to quit his job and stop using the fake name "Akihiro Higashiyama".

### Hijiri Matsubase

Onii-san dislikes the detective. He does not want him to get involved with him and Sachi, He notices Sachi doesn't act the same ever since she started talking to him. His is concerned that she may choose to  let the detective adopt her, than remain with a criminal like him.

### Ryotaro Yashiro

Onii-san does not trust Yashiro, who is detective Matsubase's assistant. Even though he is much kinder and calmer than his boss, Onii-san is weary of him.

### Tsugumi

Onii-san stops Sachi from killing Tsugumi in the forest behind a shrine. He tells her that although he does not care about what she does with her life, she seems that she's not ready to die yet. He tells her to wait for someone who can help her, and leaves her with Matsubase and Yashiro.

### "That Man"

The man yet to be named who found Onii-san on the street and raised him like a parent. He now hates sunsets because the man died during one. Onii-san has respect for him. Onii-san has been succumbing to depression now that he has been living on his own after the man died. At one point, that man told him he would not be able to live alone in the world, and now he understands what he meant. However, he knows that man would be angry if he saw Onii-san stalking Sachi because of resentment, depression, and loneliness.