Having become the greatest of thieves after long years of training, Yushin finds himself mixed up in spite of himself in a fight where several clans of fighters clash. The object of their covetousness: the great book of martial arts. Yushin learns that he is, in reality, the legitimate successor of Guimun, the founder of one of the clans. He will face Dumyo, the current leader, in a duel. A heavy secret hangs over the young thief, his existence is threatened...