Yuri lives with her husband, who became disabled while protecting her, and his step-sister. Yuri is tormented by guilt and her body gradually begins to ache... One day, her brother Yusuke sees her masturbating and attacks her, and she climaxes multiple times during sex for the first time in a long time. When Yuri's obscene sexual behavior becomes known, she becomes a sex toy at the mercy of her brother and sister...
