Ema returns to her in-laws' home for a visit while her father-in-law lives there alone. After paying respects at her husband's mother's grave, one night she accidentally witnesses her son-in-law and his wife engaging in intimate relations. Seeing that his son cannot satisfy his wife, the father-in-law grows intensely frustrated. The next day, while Ema is cleaning her room, he approaches her, boasting that he could make her climax multiple times. Initially resisting, Ema gradually succumbs to her father-in-law's insatiable virility, losing herself completely to the overwhelming pleasure.