This remind me of Great Teacher Onizuka

Rereading this now it's got an official translation via Webtoon. It seriously is ridiculous, I didn't think anything could be more ridiculous than Study Group but this has WAY surpassed it. The first school arc is the weakest, actually (it's explained via story as the agency also doing a trial run) but it becomes something tangibly interesting once the agency expands -- we get different perspectives, different goals, and different settings. There's a decent strand of plot running through this, some fleshed-out themes, and it's interesting to follow. But as AM_Woody says, it's also just shitty people getting dunked on by slightly less shitty people. What more could I ask for?

You're not reading this for a moral high-ground, or a violence begets violence story (yet at least). As of ch. 17, it's just shitty people getting dunked on by slightly less shitty people, and it's bloody enjoyable.
It's obviously gonna be formulaic, so I'm interested at what curveballs are thrown to keep everything fresh.