A couple in a rut, Iro Narumiya (41) and her husband. Believing his wife to have an M tendency, the husband seeks out a bondage master to break the monotony. With his wife's consent, she is subjected to tight bondage and training in front of her husband. In front of her husband's eyes, she is bound and trained lewdly, experiencing intense pleasure for the first time while being watched by her husband, which excites her. The husband also becomes aroused watching his wife being violated in front of him. The bondage training continues, and the wife is driven wild by the whip, guided to pleasure by another man's penis.