Yuko Kawai works at an advertising agency in Tokyo, but her ordinary life leaves her anxious about the future. As she nears her 28th birthday, a fortune-teller warns that her next yes-or-no answer could change her fate. Soon, a mysterious man offers to grant her wishes for a year in exchange for her shadow. When success and good fortune begin to arrive, Yuko must ask whether getting everything she wanted will truly make her happy.