Two years into her marriage to Nobuo, Yuka was living an ordinary, happy life. But everything changed when her father-in-law, Koinosuke, retired and began staying home all day. Every morning she cheerfully sees her husband off to work, only to face her father-in-law's relentless advances each afternoon. Known as a lecherous old man, Koinosuke manipulates and coerces her into submitting to his desires. Unable to resist his persistent seduction, Yuka is violently taken against her will. Shocked and humiliated by this sinister side of her seemingly gentle father-in-law, she spirals into emotional turmoil. While she maintains a cheerful facade in front of her husband, at night she is repeatedly impaled on her father-in-law's cock, her spirit eroded with each encounter. As her inner world fractures and her marriage begins to suffer, Yuka struggles to find a way to protect herself and decide what path to take in the future.