Four years into her marriage to her husband, Sadao, wife Marina lives with her father-in-law, Atsuo. Outwardly cheerful and seemingly happy, she hides a dark secret—ever since being forcibly taken by her father-in-law six months ago, she has been trapped in a disturbing, ongoing sexual relationship with him. As soon as she finishes sending her husband off to work each morning, Atsuo's hand moves toward her most intimate area. Smiling faintly, Marina pleads, "Please, Father-in-law, forgive me." Yet in stark contrast to her words, thick arousal steadily oozes from her pussy. An abnormal relationship lurking beneath the surface of everyday life unfolds like a scene from a dramatic film.