Thanks to the machinations of 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 who will reign 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 motive behind Ieyasu Tokugawa's orders to fight. But the Iga have 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!