I remember that I read a LN, where the world suddenly changes. The MC is in school and has to first qualify for the fight in some weird portal/ring. He gets some bonus ability because he is the fist to step into it. I remember he fought a lot of different creatures with a couple of girls (obviously). And I know he fought some gobling in a bathroom (where they spawned) in such a manner, he got a psychopath title. Does anyone remember that LN? I wonder if it was any good...
And now I realized, why I dont remember it Year and a half of no updates and the author is doing a rewrite of the novel. God knows if it would continue.