Satoshi is the student body president and a third year student. Many girls are interested in him, but he is only interested in Meiko, and tries to get her to like him in place of Namura. However, his crude sense of humor does not impress Meiko, who thinks he is an irresponsible playboy. They go out for a time, but Meiko is unable to overcome her feelings for Namura. Satoshi tries several times to make her forget Namura, but following the "Hiroshima arc" he sees that he has no chance to win her over and stops his romantic pursuit of Meiko, staying friends with her instead.
Satoshi is the first person to notice Yuu's interest in architecture. His initially unusual behavior towards Yuu arouses Yuu and Miki's suspicions that he is gay and has a crush on him, which he uses to his advantage. Satoshi and Yuu eventually come to an understanding however, and Satoshi helps Yuu uncover the truth of who his biological father may be, as he suspects that his father Yoshimitsu is a potential candidate. Although it is later revealed that Yoshimitsu is not Yuu's true father, but Satoshi and Yuu stay best friends after this.