During her husband's business trip, Ayako found herself alone with her father-in-law, feeling uneasy deep down. The father-in-law had long harbored feelings for her that went beyond mere family ties. Taking advantage of his son's absence, he began a secret affair with Ayako. His passionate demeanor and skilled techniques awakened a deep, slumbering desire within her. Before long, she transformed from a dutiful wife into a woman craving another man—her father-in-law.