芹沢　識

Serizawa Shiki is a first-time student at Souryou, entering the school after a rough summer vacation in which he tried to commit suicide, but was stopped by Otoya. They reunite at school, but Shiki does not remember him from that time. He is very introverted and passive due to family problems, and because of his introverted character he is the object of bullying at school. He loves to read, and will read books on any subject, making his reading choices very random. He also loves tropical fish, but because he is not allowed to keep a fishtank at home, he frequently goes to the fish shop to watch the fish.

Voiced by Sakurai Takahiro.