A mangaka whose works are all maleoriented manga particularly in the shonen demographic. He falls in love with Sono Hanasaki a mangaka and photographer who writes pornographic hentai manga. Seiji Yamada first meets Sonosan after he finds Sono Hanasaki039s lost camera but is surprised to find out that Sono is a guy Even though Sonosan is a man his ridiculously pretty face and erotic gestures seduce Seiji anyway. It is mentioned Seiji Yamada is inspired by Hanasakisensei039s drawings of beautiful erotic bishoujo in his manga. He is voiced by the singer of CONNECT Kenichi Suzumura.