在这部卡姆伊之剑动画/动作/冒险片中,以幕未混乱期为背景的忍者动画。 主人公次郎因为被怀疑杀害了自已的父母和姐姐，而从村子里逃了出来，他被一个男人收养，进行忍者的修炼。 成为了优秀忍者的次郎，接受命令，前往虾夷，在那他得到了卡姆伊之剑，次郎将如何解开身世之谜……
An orphan named Taro killed who Tein-Hei told her was the killer of his family. Taro found out, years later that Tein-Hei is the true killer and the man he killed was his father. Taro's revenge attempts start off a trail of assassinations and ninja swords fights spanning from Hokaido, Alaska to California where Tien-Hei's secrets gradually unfold. The revenge road leads to a climactic battle with Tien-Hei on the fall of Japan's Shogun-era.
