The besieged Toyotomi clan in Osaka castle, is all that stands between Tokugawa Ieyasu and complete control of Japan. Ieyasu’s ninja are the only ones who can penetrate the fortress, but unfortunately for Ieyasu, the other Toyotomi ninja can just as easily get out. As armies of samurai maneuver for battle, the fate of the nation will be decided by a desperate struggle in the dark!