Oboro and Gennosuke are in love, unfortunately for their romance they are also the leaders of rival clans living in the remote mountains of 17th century Japan, these two clans have, over the centuries, perfected the arts of ninjutsu (known as "Shinobi"), which is far beyond the reach of mere mortals. As the rivalry between the two clans intensify a contest is arranged where the finest warriors from both sides compete to the death.