Naho's daughter has a husband named Atsushi. In addition, she was pregnant with a five-month-old child in her daughter's womb, and for Naho, who lost her husband early, it was a happy life for her family of three. But one day, when Naho got out of her bath, there was Atsushi looking for Naho's underwear. Atsushi runs away in a panic. From that day on, her mother, her daughter, and her husband develop into a lewd love triangle.
