Maiko has moved in with her son and his wife since the third anniversary of her husband's death. At first, Maiko and her son's wife were tense with each other, but they seem to have built a good relationship and are living happily together. However, Maiko's body aches due to the loneliness of her husband's absence, and she distracts herself by masturbating, which has become a daily routine. Late at night, she was soothing her aching body again today, but her son saw her doing so. Just as she was reaching orgasm from the act of soothing herself, her son appeared and inserted his hot erect rod into Maiko's body, which she refused. Maiko gave in to his desire, even though it was against his will, and after that she did as her son asked, but gradually Maiko began to desire her son. At that time, something strange happened to Maiko's body. Her period ended. Maiko felt that her life as a woman was over, so she told her son about it and asked him to end their relationship, but...