Following his resignation from his previous job, 27-year-old Kaizaki Arata finds it challenging to secure a new one as his interview skills are insufficient. But, his life takes a sudden, remarkable twist when he encounters Yoake Ryou, who is part of the ReLife Research Institute. Yoake offers Kaizaki a drug that can modify his looks to those of a 17-year-old and persuades him to engage in a year-long research project. Consequently, Kaizaki embarks on a fresh adventure, as a high school student, commencing a new phase of his life.