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Naho's daughter has a husband named Atsushi. In addition, her daughter had a five-month-old child in her stomach, and for Naho, who died early from her husband, it was a happy life for the three family members. However, one day, when Naho got out of the bath, there was Atsushi looking for Naho's underwear. Atsushi runs away in a hurry. From that day onward, the mother, daughter, and her husband develop into a lewd love triangle.