Is it a powerfantasy isekai? yes. Is it poorly explained and sloppily written? Probably. Is it enjoyable? Yes. Don't take the manga too seriously, because even the protagonist doesn't. Its a fun manga where the main character is fully aware of how edgy he is, and leans into it, creating his own powerfantasy. Its *almost* a parody, and thats when I enjoyed it the most. Narritive wise its not the best, nor the most intricate with its world building, I wouldn't recommend this manga if you were to take everything at face value, because then it becomes another boring OP isekai manga.