The story takes place in Kanagawa prefecture and revolves around Keitarô Urashima, a 19-year-old ronin desperate to join the prestigious Tokyo University to fulfill a childhood promise made to the girl of his life. . He obsessively pursues this dream in which he places all his hopes in order to regain his love of childhood or, at least, to enjoy the student prestige of Tôdai to seduce young girls ...