At her husband's suggestion, Aoi visits a nearby couples massage salon. She trusts her devoted husband completely and vows never to betray him. A female therapist handles her husband while a man named Yamamoto works on her. Everything seems normal until Aoi turns onto her back and Yamamoto reveals his true intentions. The female employee is in on the scheme, and with her husband asleep on the next bed, Aoi is folded back with her legs over her head in a humiliating position she has never even shown him as the so-called treatment takes a sexual turn.