Once a powerful ninja, Kamui decides to walk away from his violent ways and seek a peaceful life. His travels bring him to a seashore village where he meets Hanbei, a fisherman who shares the former ninja's sense of honour. They become good friends, and life at the seaside seems idyllic. But one day, a band of pirates arrive. It seems that Kamui's past life is catching up to him. Now he must draw upon his shadowy arts if he hopes to escape with his life.