Well, honestly the world building was too horrible for words right from the start, so not really expecting anything half-decent at this point when it comes to background story or logic. It's like a mishmash of modern day japan, a fantasy world and some other weird shit I can't quite put my mind on, ending up in a volatile mess of pure garbage world building.
The whole "people have to cripple their power if they change jobs to a non-combatant one" bullshit rubs me the wrong way, but not nearly as much as the idea that "even the guards can't learn more than a single damn skill from their job even though they're fully capable of learning more". Look, I get if, in this weird world, the skills equate something like weapons and don't fit into normal society where things are clearly more akin to modern japan and completely safe and peaceful. Sure. But people RISKING THEIR LIVES and with a pretty damn high mortality rate (wasn't it like 14 men and 9 women in a month and that number was normal?), fighting to protect others, these people are NOT ALLOWED to get as powerful as they can to avoid dying and better protect others? They can just pick 1 skill and be happy with that because people are scared that the power will go to their head and they'll commit massacres or something, or perhaps just abusing the power against the clearly more powerless masses?
That system is god damn idiotic, there's no way that would ever fly in any kind of world with monsters or, hell, any world at all for that matter for occupations that require these skills like guards, police, military and so on. There's also the stuff like white mages having to get paid every time they heal someone, even friends or teammates. Why the f*ck is that even a thing for GUARDS where healing is a basic necessity and should be free, or rather a part of their job and included in their monthly wage? Maybe I can reluctantly agree that it might be reasonable in the case of random civilians requiring healing having to pay, but not people fighting deadly monsters firsthand, they and everyone in their team should be exempt from that particular system, it makes zero sense.
But, as I said before, I didn't expect anything at all in world building from this manga where everything relies on 1: comedy 2: ecchi. Decent story or world building is the last thing prioritized here. While some things still manage to rub me the wrong way, I'll just look the other way and laugh at their stupid adventures instead, however artificial it feels at times. But you can be sure that if this was a novel, I would've dropped it for these flaws since a novel relies on writing, world building and story to tell everything including jokes while manga relies more on the pictures in tandem with the jokes more than story and writing, at least for a manga like this. You don't need to ruminate the bad parts for long in a manga as it moves quickly and doesn't rely much on you having to understand from the words.