ReLIFE

ReLIFE (リライフ, Riraifu) is an ongoing Japanese science fantasy drama seinen web manga series written and illustrated by Yayoiso. It's published by NHN PlayArt on comico website since October 12, 2013 and has six volumes compiling the chapters published by Earth Star Entertainment released so far. An anime adaptation was announced on February 13, 2015 and aired on television on July 2, 2016. On June 24, 2016, the series was released in full on the web. Tokyo MX, GYT, GTV, and BS11 later broadcast each episode in the usual weekly format.

Plot
Kaizaki Arata is a 27-year-old, out-of-work man who has failed at each and every job interview he has had after quitting his last company where he only lasted three months.

His life changes after he meets Yoake Ryou of the ReLIFE Research Institute, who offers him a drug that can change his appearance to that of a 17-years-old again. Taking the drug, he becomes a subject in a one-year experiment in which he begins his life as a high school student again.

Official
http://www.comico.jp/articleList.nhn?titleNo=2