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; Yuusaku likes the student council president Sumire Kanou. Despite being on the student council, he is in violation of riding a motorcycle to school.