Then it all changes into more of a typical harem isekai anime like SAO season 1 which was terrible. The characters in the beginning were fine, and believable enough, but as time progresses, you can only think that the other heroes have bleach in their eyes cause they can't piece together anything of what is going on.
The MC proves his worth and is very pivotal at one point, and still the others would neglect him. As of writing this, we still don't know how the world works or any of the villains ulterior motives.
In terms of combat, it also started out amazing, but then it all boils down to a certain "power" the MC obtains and thats all he does later akin to a naruto fox mode "cheat". We ahve no idea how the combat is balanced as a lv20 can stand his ground and even win a lv40.
Overall I can only give this a 5/10 mediocre. It would be lower if not for the beginning and its premise although there was alot of potential here.
