Jun Ushiro

A boy with a short fuse, whenever he is upset by anything, the first thing he does is beat Kana, his younger sister. Ushiro's mother died giving birth to Kana, which would explain his hatred toward her. Later in the series, he begins to develop feelings towards Yōko Machi. Machi's death had him in a depressed state of mind in both the manga and the anime. Being accused of killing Takashi affected him greatly. That's a main reason he chooses to stick with the others in the manga despite not being bound to the contract Jun is also somewhat of a slacker Preferring to stay home and don't do much.