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 on the assumption that she would get a divorce, her son came home for the summer vacation. Her son confesses that he liked her mother on a hot spring trip to report her divorce. She is more moved by the kindness of her son than her heartless husband, and even though she thinks it is wrong, her sense of immorality as a mother and her joy as 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!
