Jack is a 28 year old man that is unable to find a stable job. One night he meets Ben from ReSTART Laboratory who offers him participation in the ReSTART Project.
Jack accepts the job and then he soon learns that it involves him taking a medicine that makes him look like he is 17 again.
Jack was told that it was both an experiment and an opportunity for him to relive his life and an attempt to change his current self. His job was to be enrolled and to study high school again.
Ben told Jack he is not allowed to tell the other students about the experiment or else the experiment and the opportunity for him to change will be stopped. Jack was also told the experiment will last a year.
The experiment and the opportunity for him to change has started. Jack made some friends and became really close to them. Really close that even he knows about their personal issues.
Jack met a girl in the school and after a few months they fell in love with each other. And then a sudden though came to his mind.