Thanks to the machinations of the Ieyasu Tokugawa, the age-old truce between the Kouga and the Iga clans is no more—and now a fight to the death will decide which clan reigns supreme. Oboro has blinded herself in order to avoid having to kill Gennosuke, her lover and her rival. Meanwhile, Gennosuke has urged the Iga clan to join him on a journey to Sunpu to find out the real motives behind Ieyasu Tokugawa’s orders to fight. But the Iga has other plans. The hirsute Nenki and the butterfly-wielding Hotarubi rush to assassinate Gennosuke, while Tenzen has sinister intentions for a defenseless Oboro. The epic battle of blood and betrayal continues!