Momo Natsukawa (Kumiko Endo) is a rising actress. Her close friend Machi Tamaru (Emiri Henmi) happens to be her manager, but she's about to quit in order to get married. Right before her ceremony, a "time slip" suddenly transforms her into her childhood self, 18 years younger. And right before her, she sees a 9-year old Momo as well...