Japan, 1625

A new Drum Master has risen, and soon the nation will fall to the curse of Izanagi. Answering the call of his kotsuzumi, dead warriors abandon their peace to once again roam the land of the living, swinging rusty blades and chattering rotten teeth at his behest.

Japan's last hope lies in the hands of the nine warriors gathered by the young daimyō of Owari. To reach Onijima, where the source of the curse's power awaits, the Nine will not only have to face swarms of undead samurai and waves of shinobi mercenaries but even more dangerous to their mission, their inner demons.

Against the undead, the Nine only have two choices, fighting as one or becoming them.