The main character fights against his best friend who has gone to the dark side during the apocalypse. The friend uses dark magic to go back in time, but the MC ends up swept up too. The mc's journey to keep it a secret and get stronger as his friend does his best to make up for his mistakes.
The MC is overpowered and becomes a god like within a few chapters. The plot is too rushed and doesn't give the readers a sense that there is any point to the story. I was willing to read a bit longer to see the faces of the MC's classmates as they realize he has become a god, but the lack of suspense ended it for me.