Hakuo Academy was once a prestigious high school renowned for its martial arts, but it began to decline when the rival school Seishikan started poaching superior students through underhanded means. To turn things around, Hokujo Hikoko, the chairperson of the board of directors, sent a messenger to Fuma Village. The Fuma Clan was a legendary ninja group said to be capable of running thousands of miles in a day, hearing a needle drop from three miles away, and distinguishing a person's face in darkness from a mile off. The clan's leader dispatched Kojiro to the academy. Upon arriving, he found himself thrown into battle against the Yasha Clan, who worked for Seishikan, and their most formidable enemy, Asuka Musashi. Musashi fought to support his little sister, who was suffering from an incurable disease.