Talk:Yū Otosaka/@comment-78.19.6.199-20170314233310/@comment-67.0.209.9-20170326020451

Kazuki Tomori, Nao's brother, has the power to manipulate sound waves. Yu's power is to possess others, and to take the abilities of anyone he possesses. Yu loses all his memories because he went on a heroic quest to take everyone's powers. Kazuki becomes hospitalized because he was endlessly experimented on for a long time and eventually went insane. However, it is assumed that he got better at the end of the series.