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Miho gave birth and got married at a young age, but gradually became sexless, and when her son entered college, it was discovered that her husband was cheating on her. While she was living separately from her husband with the intention of divorcing, her son came home for summer vacation. The son confesses that he liked his mother on a hot spring trip to report his divorce. She is more moved by her son's kindness than by her heartless husband, and even though she thinks it is wrong, her sense of immorality as a mother and the joy of being a woman are at odds with each other. A parent and child forget themselves and have sex in a small inn deep in the mountains...A story of mother and child incest!