One deep, dark night in medieval Japan, a pair of horribly wounded warriors bangs at the door of an eerie, seemingly abandoned fortress hidden high in the mountains. An alluring young woman allows them in, and they promptly fall unconscious to the floor. Later, the younger samurai awakes to find his wounds inexplicably healed and his companion gone. Before him is the master of the fortress, an elegant yet reclusive stranger with a mysterious air.