The story centers on the drama resulting from the rivalry between two ninja clans in feudal Japan. While living deep within the mountains, the two clans have honed their skills to superhuman levels, but are restrained by imperial decree from battling each other.
Four centuries of simmering tensions threaten to boil over when the Shogun requests the clans appear before him. Fearing that rebels may use the ninjas as instruments of insurrection,
