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Momoko has an only son who is about to go on to college in the spring. She was overprotective of her son because of her love, but one day she received a call that her son had taken a voyeur on the train. The men, who claim to be well-meaning associates, offer conditions to the upset Momoko to settle out of court, saying, ``Don't let the child go on to school.'' That is «to be with men for just one day». For the sake of her beloved son, Momoko obeys the men, but when she is blamed, she begins to realize her masochism.