Nao, a daughter-in-law living happily with her husband in a detached house, had a problem. It was the absence of conjugal relations with her husband and the presence of her cohabiting father-in-law who sexually harassed her. Nao turned a blind eye to his behavior, attributing it to his loneliness after losing his wife. However, encouraged by Nao's attitude, her father-in-law's harassment escalated. One day, Nao's sexual frustration reached its limit, and she ended up masturbating in the bedroom. Unbeknownst to her, her father-in-law had been secretly watching.
