With only three ninja remaining on each side, the battle between the Iga and the Kouga clans is nearing its bloody end. Believing he has slain Yakushiji Tenzen, shapeshifter Saemon Kisaragi morphs into Tenzen’s body and infiltrates Iga territory. But what Saemon doesn’t know is that Tenzen is an immortal ninja, and that he has his own plan to dispose of Saemon and the Kouga clan. Meanwhile, Oboro, leader of the Iga clan, has sworn that she will die rather than fight against her lover, Gennosuke. Every death brings these two star-crossed lovers closer to confronting each other on the battlefield at last!