Tokyo Revengers (2021)
#18 in Anime (Watchables)
Perhaps Takemichi Hanagaki's second year in middle school was the best part of his life: he had a gang of trustworthy friends, people look up to him, and even had a girlfriend of his own. But that was 12 years ago and things had changed today - he's a loner and seen as a nobody who is often made fun by children.
One day, he receives a news of the murder of the only girlfriend he's ever had, along with his brother, which made things even worse. Just when a train was about to end his life for good, Takemichi finds himself back to the exact same day twelve years ago, when he and Hinata Tachibana are still dating.