Returning home, the demure wife, Ayako, is approached by suspicious men who ask for her help as a last-minute replacement for a health equipment monitoring survey. Promised it will be quick, she agrees and follows them to a studio. After receiving instructions, she's handed a vibrator and left alone. Watching the monitor footage turns her on, and she begins masturbating with the vibrator. Just then, the staff return, catching her in the act with no chance to explain. Helpless and exposed, Ayako is used by the staff as part of their "job," and in the end, is filled deep inside with a generous creampie.