An story where our MC will try to fix a bunch of egoistical group of bullies... That sounds interesting isn't it? But far from only that, this manga contains some of the darkest things I've ever see. Suicides, rapes, bullying, drugs, depression, the list goes on. At the star you can compare our MC with Onizuka, one teacher capable of everything, but while you keep reading you'll see that MC is only a broken person, there's no light in his eyes, there's no hope for him. The story will make you wait for the revelation of the plotwist, at 40 chapters I can say that this isdepressed af.
Desing wise their look too "moe" but it contrast with the worldbuilding, every girl here is cute but they're demons capables of the worst things.
Characters have their flaws but it works along with the story to make them more realistic.

PS: I only hope that MC get some rest at least.