For centuries, there lived warriors of darkness and shadow with strange powers and arcane skills, living only for battle. They were the SHINOBI. The year is 1614. Japan has been united under the Tokugawa Shoguns and the land is begining to feel at peace. Two remote ninja clans, the Koga and the Iga, are ancient enemies but have long been bound by a peace agreement forbidding them to fight. The heirs to the leadership of both clans have fallen in love but a tragic fate awaits them. A cruel plot is set by the Shogun to wipe these two clans from existence by breaking the peace agreement and forcing the two clans to battle. Five Ninjas of each the Koga and Iga clans will battle against each other to the death. As a great war begins it brings the two young heirs together again. But this time as enemies.