Yui, a wife, lived peacefully with her husband. One day, her husband's brother, Hideo, came to their house while he was looking for a job. Since she and her husband rarely had sex at night, the opportunities became fewer when Hideo came, so Yui satisfied her sexual frustrations by masturbating. By chance, Hideo saw her and raped her. Unlike her husband, Hideo worked as a manual laborer, and his intense thrusts brought Yui to orgasm in an instant. However, Hideo's thrusts continued unabated, tormenting Yui even more after she had just orgasmed...