The bloody battle to rule Japan has begun: The Iga and the Kouga clans are locked in a fight to the death. Driven by a centuries-old hatred, each clan will do anything to annihilate the other. The Kouga clan is engaging in a little espionage, and has planted a shapeshifter, disguised as an Iga ninja, in the Iga palace. Meanwhile the Iga clan turns to its last, best hope: their new leader, Gennosuke, the only one who can defeat the Kouga's formidable leader, Oboro. But is she willing to kill the man she loves? As the war grows more desperate, will true love be the next casualty?