Nathan Algren is an American hired to instruct the Japanese army in the ways of modern warfare, which finds him learning to respect the samurai and the honorable principles that rule them. Pressed to destroy the samurai's way of life in the name of modernization and open trade, Algren decides to become an ultimate warrior himself and to fight for their right to exist.

Island of Java, 1942, during World War II. British Major Jack Celliers arrives at a Japanese prison camp, run by the strict Captain Yonoi. Colonel John Lawrence, who has a profound knowledge of Japanese culture, and Sergeant Hara, brutal and simpleton, will witness the struggle of wills between two men from very different backgrounds who are tragically destined to clash.