In a RPG setting, certain people are chosen for this special job where they borrow levels off of their adventuring companions and become crazy broken for one battle.

All jobs and classes are given based on levels and I think the government is corrupt slightly as a result?

Art reminds me of ACCA

MC is bitter and edgy but dedicated towards his job and role.

https://www.mangaupdates.com/series.html?id=113170 I only read the first few chapters but the concept was similar to what you are describing

I checked the Level System tag and came across that earlier. While I have yet to read it, thanks for the reminder to bookmark it. I like the art for it!

Edit: This is the one I was looking for and was thrown off by the cover since the MC isn't on it.
Thanks and this thread can be locked!