Yuna lives a harmonious married life with her husband. One day, after a fight with his wife, her father-in-law rolls in to stay at the same house. Her family-oriented husband accepts this, but she herself finds it hard to accept internally. Yuna's dissatisfaction grows by the day, and her father-in-law's sexual harassment escalates, eventually crossing the line... She ends up getting hooked on perverted sex with her father-in-law, whom she was supposed to hate.
