Yuusaku is a male student in Ryuuji's class, and is his best friend. He is the vice-president of the student council, the class representative, and captain of the boy's softball club at school. Yuusaku wears glasses, and has a diligent personality. He thinks he is poor at talking to girls, though Ryuuji observes otherwise. During his time as the vice-president of the student council, he eventually falls in love with the student council president, Sumire Kanou. A running gag is that he will appear out of nowhere behind Taiga and Ryuuji when they are discussing a "plan of attack" to get their crushes. Like Minori, he has an unusual personality, but oftentimes it is an expression of his friendship and appreciation.