After her husband's passing, chiyoko starts living with her daughter and son-in-law. She builds a good relationship with her son-in-law and feels happy with her peaceful days. However, the loneliness of retirement is unbearable for chiyoko, who is still active as a woman. Her daily masturbation becomes more intense. She is so absorbed that she doesn't even notice her son-in-law watching. She just wants a cock... Her seductive figure, lost in masturbation, drives her son-in-law to betrayal and adultery.