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In part five of the 8-part Shinobi No Mono Ninja film series the heroic ninja Kirigakure Saizo (Raizo Ichikawa, of Sleepy Eyes of Death fame) serves the daimyo Sanada, played by Lone Wolf and Cub star Tomisaburo Wakiyama. They are assaulted by Ieyasu and his soldiers. They flee to an allied camp, and once there start plotting how to fight back and win the war. They come across a gun merchant with a unique, three-barrel gun, giving the holder incredible fire power. They begin to strategize ways to find out how the merchant selling these firearms has acquired them, hoping that possession of these weapons in their arsenal will lead to ultimate victory. The merchants of Tanegashima are the makers of the gun, and claim they have made it according to a blueprint gained from the only Western traders they are allowed to do business with, the Portuguese. The Sanada partisans know that can't be true because the 3-barrel gun is made of iron too fine for the Portuguese to have access to. They ...