Ryouko is a housewife living a happy married life, her days filled with warmth from her husband and the laughter of her family. But everything begins to change when she starts jogging. The exercise tightens her body, dramatically transforming her figure. One day, returning home from her jog, she encounters a suspicious man at her front door. From that moment on, Ryouko's life takes a drastic turn. An innocent woman with a pure heart, simply living as a devoted homemaker, is suddenly dragged into a horrifying ordeal.