Chihiro, a married woman, buys a small apartment in Tokyo with a loan and lives with her husband. - One day, a man named Kita, who claims to be the manager of a jewelry store, visits and suggests a custom-made ring. - Chihiro, who couldn't go on his honeymoon, was attracted to the ring and Kita said, ``I'll give it to you as a trial run until the weekend, so please consider it.'' Kita leaves. - Coincidentally, that night, her husband was planning to give her a belated wedding ring using the pocket money he had saved. - Kita tries to refuse Kita's offer, but Kita reappears and has set an unexpected trap for Chihiro...