At age 31, office worker Chikage Deguchi feels she missed her chances at love and success. When word gets out that she's a virgin, Chikage is humiliated and wishes she could turn back time to when she was still young and popular. She takes an experimental drug that changes her appearance back to when she was 15. Now Chikage is determined to pursue everything she missed out on all those years ago--including becoming a star!

To pursue missed chances at love and success, 31-year-old Chikage Deguchi takes an experimental drug that changes her appearance back to how she looked at age 15. Chikage tells Tokita she's decided to date the teenage Ru as her 15-year-old self, and Tokita wonders how things might have been different if he had confessed his feelings for her back in high school...