This film is adapted from the Japanese writer Funtaro Yamada's masterpiece Ninja Koga of the same name. It was released in Japan in September 2005 with a total investment of 1.5 billion yen. When Tokugawa Jiakang dominated the world in 1614, two long-hostile ninja villages, IGA and Koga, in order to maintain peace, the ancestors of the two sides made an agreement not to communicate with each other but to fight each other regularly. The individual heirs of the two ninja villages, Oboro (played by Yukie Nakama) and Xianosuke (Cesuke Oda), meet and fall in love without knowing each other's identity, but the tragic fate is waiting for them. In order to really grasp the political power, Tokugawa launched a political plot to provoke conflicts and antagonism between the villages on both sides, so as to eliminate each other's races. At this time Oboro and Xianosuke will be forced to become enemies, and the two must carry out the family mission to fight a duel.