Her name is Minori. She suffered from a pitiful illness—an uncontrollable sexual desire, constantly craving a man's penis. Feeling sympathy, her older brother made the decision to lock her inside a unit bath and keep her imprisoned. He resolved to keep violating her, finding pleasure in her repeated orgasms every time they touched. The joy he felt from violently penetrating her throat became an essential craving for him. Yet, these acts only drove his sister deeper into despair...