That JAV

A sister and brother are imprisoned in a prison. To protect her beloved brother, the older sister Yumi Kazama is trained to become the prison warden's sexual lover. She is forced to masturbate in front of the warden's eyes, to perform oral sex while her hands and feet are restrained, and to have sex with him until he is satisfied... Finally, Yumi cannot stand it any longer and rebels, but her brother is taken hostage and she is sent to the corporal punishment room where she cannot resist. Yumi's ego crumbles when she is forced to have sex with her brother, who was brought to her forcibly.