Otokojuku, a private school for juvenile delinquents that were previously expelled from normal schools. At this school, Japanese chivalry is taught through the feudal and military fundamentals. Similar to an action film, the classes are overwhelmed by violence. Only those who survive it become true men.

The anime is based on the manga of the same title. The first half of the series is comedic, but later develops into a serious and action focused anime.