So the main character is seen as very weak, and acts very passively in the first 18ish chapters. He takes ab*se from his students and overall is just a very passive protagonist that I as a reader just find boring. It's somewhat realistic, sure, since a 30 year old teacher is suddenly thrown into another world with teenagers, who then proceed to act like a teenager would if they had suddenly been given a lot of power, irrationally. He believed himself to be weak and just overall the start of the story was kind of a slog to get through, since its just the protagonist being harassed or setup of world building. Now, after chapter 18 one of the students who I believe was nice to him but suppressed by the others being the majority (? bit unclear since I can't honestly tell them all apart) but she broke up with her boyfriend, and he took it badly and messed with the teleportation device sending her to a danger area, so the teacher (still believed to be weak) asked to be sent there aswell so she is at least with someone. Now that he is there, he found that he could kill monsters with his sword and is starting to become op like the title says, but since only a few chapters have come out its unclear on how the direction will go. I'm hoping that it becomes a lot more interesting now that he is actually fighting so I'm marking this in my waiting for chapters. So overall, at least with the current 21 chapters I wouldn't recommend the novel, but I think it has potential once we get further in the book.