Discarded by those around him as a hopeless loser, Arata Kaizaki, 27 years old, bounces from one job to another when he leaves his first company. His unprecedented world takes a sudden turn when he encounters Ryou Yoake, a ReLife Research Institute associate, who offers Arata with a mystical pill the chance to make a living better.
If he takes it without a second thought, Arata wakes up the next day to discover that he is down to 17. Arata quickly discovered he had to go to secondary school for one year as transfer student now that he had a rare experiment. In the first time, Arata thinks it is going to be a cinch because of his high level of living, but his first day has proved himself sadly wrong, flunking all his exams, totally out of shape and not embracing the latest school policies which have arisen over the past 10 years. In addition, Ryou was assigned to watch, adding continuing irritation to Arata. Relife follows Arata ‘s attempts to adapt to his hustle and bustle of new life and to prevent repeat his past errors, while slowly learning about his classmates