Due to too much stress and fatigue in studying, the lascivious schoolgirl Kimura decided to masturbate to be able to relax and relieve some of her stress. But unfortunately, nothing is perfect, while masturbating, the brother who had just gone drinking with a friend also came home. Discovering that his chubby sister was masturbating plus drunken yeast still lingering in his body, he forced her to have sex with him. Partly because she was afraid that he would take the risk, and the other part was afraid that her parents would know because he threatened to speak, so she had no choice but to do whatever her bastard brother wanted.