With her husband's company in financial trouble, Nami starts a women-only mobile massage business to help support him. Customers are scarce until she finally receives a booking from someone claiming to be a woman. The deep voice on the phone makes her uneasy, and when she arrives, she finds herself at a single middle-aged man's filthy apartment. He smoothly talks her into providing the treatment, and she tells herself it will be only this once. But the huge bulge visible through his underwear catches the eye of the sexually neglected wife...