After collapsing at his black company that ravaged his body and soul, Shinichirou Niihama finds himself in his second year of high school. His high school life was dark and gloomy... however, he is certain that he can start it over.

Haruka Shijouin, a beautiful girl whom he met before, suddenly appears even more innocent and cuter than Shinichirou remembers, and above all, she stares straight at him...

"I feel that you are quite different from the Niihama I knew yesterday. You seem like an adult, but while still keeping your kindness!"

If he could change the future, Shinichirou would, without a doubt, save her after she died following severe bullying. With his adult mentality and corporate powers, he is going to enact his revenge by bringing the best out of his second youth with her!

Inkya datta Ore no Seishun Revenge: Tenshi Sugiru Ano Ko to Ayumu ReLife began as a web novel on Kakuyomu and Shousetsuka ni Narou under the title "Inkya na Jinsei wo Koukaishinagara Shinda Black Kigyou Kinmu no Ore (30) ga Koukou Jidai kara Yarinaoshi! Shachiku Chikara de Seishun Revenge shite Tenshi Sugiru Ano Ko ni Kondo koso Suki dato Tsugeru!" (陰キャな人生を後悔しながら死んだブラック企業勤務の俺（30）が高校時代からやり直し！社畜力で青春リベンジして天使すぎるあの娘に今度こそ好きだと告げる！) on December 12, 2020. Kadokawa has released a revised and illustrated version of the series since February 1, 2022 under its Kadokawa Sneaker Bunko label.