The story takes place in the year 1614. Two ninja clans, Tsubagakure of the Iga and Manjidani of Kouga, battle each other to determine which grandson of Tokugawa Ieyasu will become the next shogun. The deadly competition between 10 elite ninja from each clan unleashes a centuries-old hatred that threatens to destroy all hope for peace between them.
Designed to select the successor to the Tokugawa family, a gruesome battle once promised a thousand-year reign to the winning clan. Amidst the bloodshed, betrothed lovers Oboro and Gennosuke were forced to take sides. Only ten years have passed and once again the clans of Kouga and Iga are poised to fight. But this time, a new generation stands at the forefront.