A married woman named Chihiro lives in a small apartment in Tokyo with her husband, which she purchased on loan. One day, a man named Kita, claiming to be the manager of a jewelry store, visits and recommends a custom-made ring. Chihiro, who couldn't go on a honeymoon, is drawn to the ring and agrees to 'try it out until the weekend and consider it,' as Kita suggests before leaving. That night, coincidentally, her husband was planning to present her with a belated wedding ring using his saved pocket money. Although she intends to decline Kita's offer, he reappears and sets an unexpected trap for Chihiro...
