"We may be yakuza, but we're not thugs," declares Yuzo Akimoto (Toshiyuki Nishida), the leader of a tiny clan that takes its social responsibilities very seriously. Forget drugs, human trafficking, extortion rackets and all the other standard recourses for organized crime groups. This band of gangster do-gooders abides by three inviolable rules: Always fight fair, always clean your plate and never lay a hand on respectable citizens — unless it's a helping one.
When the Akimoto-gumi's absent-minded patriarch agrees to help a struggling high school, it's left to his stern-faced deputy to take command. On his first day at school, Seiji Himura (Hidetoshi Nishijima) announces to the slack-jawed faculty that he's their new director. But when he has to deal with an unruly student, Chihiro (Wakana Aoi), he gets socked in the jaw for his efforts.
Himura and his misfit brethren soon discover that they have bigger problems to worry about. Someone keeps sneaking into the grounds at night to smash the school windows — and when they catch the culprits, they end up uncovering a conspiracy that's far more convoluted than it needed to be, but belies the film's pulp novel origins.