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In Tokyo just after World War II, Murakami, a recently appointed detective, has his gun stolen by a woman on a bus. Because pistols are scarce in postwar Japan, Murakami, afraid of losing his job, begins to hunt for the gun. He later finds the woman, but she has sold the gun to a fence who in turn has passed it on to a young hoodlum. The gun, loaded with seven bullets, is first used in a stickup in which a girl is wounded. Murakami, with the help of Sato, an older detective, finds Harumi, the hoodlum's girl friend, and when the second bullet is used to kill a young housewife, Harumi gives the detectives the hoodlum's former address. With this information Sato traces the criminal to his current address, but the hoodlum uses the third and fourth bullets to shoot and seriously wound Sato as he is telephoning Murakami. Harumi tells Murakami that the hoodlum is to meet her at a train station, and he goes in her place. The criminal wounds the detective with the fifth bullet, but when he misses with the sixth and seventh Murakami overpowers and arrests him.