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 affection, but one day she received a call that her son had voyeured her train.The men who claim to be her good-faith associates give the upset Momoko conditions for her settlement, saying, ``Don't have any negative impact on your child's admission 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 own masochism.