31 Ai Dream summary:

A 31 years old woman dreams of returning to her high school days. She was the class president and the idol of the school. However, she did not have the courage to reply to the boy she loved back in high school. After a high school reunion, she decides to commit suicide upon finding out that the boy she loved back then is with another woman now. She was saved by her class mate and given a medicine that can revert her back to how she was when she was 15.....now she is a 15 years old idol?