Koshiro is recovering from breaking up with his girlfriend. On his way to work in the train, he first meets Nanoka while returning a name tag that she dropped as she was trying to exit the train. Afte…

Koshiro is uncomfortable with Nanoka's doting presence as he struggles with his feelings for her. Nanoka takes over many of the households chores and even makes a bento for Koshiro. He reaches his lim…

Unable to sleep, occupied with thoughts of Nanoka, Koshiro remembers how in his childhood what helped sleep on such sleepless nights. After he wakes up, he exchanges the bear he just brought with Nano…

While going to the movies with his sister, Koshiro is spotted by his Ex-girlfriend. Afraid that she got the wrong idea that he was trolling for high school girls, he meets her for dinner to explain.

Koshiro is shocked to find that Nanoka has emptied the trashcan in his room that contained the tissues of his guilt. He shouts at her for invading his privacy. That night he returns from drinking and …

Nanoka discovers that she has developed a reputation at school for having a brother complex. After working late on the upcoming school festival, she is walked home by a male schoolmate. Koshiro encoun…

Nanoka receives a love letter at school. She doesn't know what to do about it. She asks Koshiro what she should do about the love letter and he indifferently says she should make up her own mind and n…

Koshiro remembers the birth of his sister and their life together before their parent's divorce. Although they were too far apart in age to understand each other, they felt a vague sense of affection.…

Koshiro contemplates moving out to resolve his situation while Nanoka plans to make him a sweater for Christmas.

Koshiro mentions to Kaname that he is thinking of moving out. She pushes him into doing it right away. Nanoka doesn't want to go home, so she arranges to stay overnight at her friend's house where she…

A month and a half after Koshiro has moved out, both the siblings are still thinking of each other, but keeping their promise not to see each other again. Nanoka sometimes walks by his new apartment o…

Nanoka breaks their promise and comes to Koshiro's apartment to see him. She offers to make him a meal, but his refrigerator is empty so he goes out to pick up some things. In the meantime, Kaname dro…

Nanoka and Koshiro visit Mama together. After, sitting by the sea, Nanoka asks Koshiro if they should commit lover's suicide. He cries and says he doesn't know. She says that she is fine either way as…