Ryouko's husband, Kenshi, is a comedian, and his younger brother-in-law, Kazuo, has been helping him with his acts. When Kazuo falls ill and begins living with them, six months pass with Kenshi stuck in a creative slump. The cause? Kazuo's erectile dysfunction. Troubled and desperate, Kazuo starts fantasizing about having anal sex with his sister-in-law, using the fantasy to try and regain his erection. Meanwhile, Ryouko, wanting to help improve her brother-in-law's condition, begins masturbating in front of him. Witnessing her act, Kazuo undergoes a startling transformation...!?