The story follows Kaizaki Arata, a 27-year-old jobless man who fails at every job interview he had after quitting his last company which he only lasted at for three months. His life changes after meeting Yoake Ryou of the ReLife Research Institute, who offers him a drug that can change his appearance to 17-years-old again and to become a subject in a one-year experiment in which he begins his life as a high school student again.
