Mission Impossible Samurai is a successful film. Naito Masaatsu is lord of the Yunagaya Domain. When a scheme is hatched by Matsudaira Nobutoki, a member of the shogun's elder council, to take over the mine by forcing Naito to complete his "Sankin-kōtai" journey to Edo within an impossible time frame, Naito enacts a daring plan to take a shortcut through the mountains in order to make the 8-day journey in only 4.