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 meets Tokita's girlfriend for the first time and is shocked to discover that she knows her! Even worse, she knows his girlfriend has been cheating on him...