陰キャだった俺の青春リベンジ (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: Shinhama collapses after a life of corporate slavery at a black company, and when he wakes up, he is time-released back to his second year of high school. Before he died, his mind wandered to the girl of his high school dreams, and he doesn't want to regret his second life. He wants to live his second life without regrets, so he decides to take revenge with her for the best of his youth!

(Translator: DeepL)