A delinquent from her brother's part-time job comes to her house and rapes her busty sister (Ayu). Her unreliable brother can't complain when his sister lays hands on him. On the contrary, he's a good-for-nothing who gets excited by his sister being raped. Ayu, whose incestuous relationship was secretly filmed, is raped and creampied by the delinquent in front of her brother.