石渡 薫

Ishiwata Kaoru is also a member of the advanced science and mathematics division at Souryou, and is Takumi's classmate. They have been going to Souryou together for many years and are good friends, and they often play tennis with each other. He is a very cheerful and sociable person, and is good at a variety of things. He likes playing internet games and dancing games, and also considers himself fashionable.

Voiced by Umezu Hideyuki.