When Japan surrendered after World War II, Shigeru Ezaki was one of the last Shadowmasters and the mayor of a small town in Iga named Ueno, whose his wife has been just killed in the U.S. atomic bombing in the closing days of the war.
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But when the U.S. Army Captain James Richards, who oversaw the occupation of Iga Province, saved the life of Ezaki's son, the two became friends and together fought against a fanatical die-hard band of Japanese military stragglers holed up in the mountains of Iga.
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The Shadowmasters are fictional characters in the Marvel Universe (Earth-616 continuity), created by Carl Potts in 1989.