Due to her stepmother Hideko's back problems, Chitose decides to help out with housework at her husband's family home. Shozo, her father-in-law, has long been attracted to the beautiful Chitose, who is far more stunning than his own son, Nobuo. One day, Shojo accidentally sees Chitose masturbating in the bathroom and is overwhelmed by uncontrollable desire at her seductive sight. Mesmerized by her, Shojo touches her lips and buries his face in her pussy, inhaling the woman's fragrance. Though frightened and shocked at first, Chitose gradually begins responding to her stepfather's advances. As Shojo's demands grow increasingly bold, Chitose's heart begins to waver.