After losing her parents and caring for her grandfather, Miho finds herself in despair when his illness worsens and medical expenses mount. Through a broker, a man named Muto is introduced to her. Despite his harsh temperament and abusive behavior, Miho is forced into the role of a housemaid in name only—secretly becoming his sexual pet. Under these oppressive conditions, the story unfolds her suffering, inner conflict, and struggle to endure the humiliation and control inflicted upon her.