Hyper-World Demon King

This is a novel with an overpowered protagonist going into a new world. With that synopsis you may roll your eyes thinking it's a stereotypical self-insert power fantasy. That was my impression as well. That is until I got further into the novel. I realized the MC isn't a self-insert power fantasy character, but more so a "Deus Ex Machina". The author writes crazily OP villains and uses the MC as a plot device to get rid of them. Think of this novel as a sandbox for creating absurdly powerful villains. When you're about to get tired of a certain villain, the MC erases them for you. I think this novel is very good if that's what you are looking for.