Anima Academy by Requiem Jeer is an original fantasy setting fic with 42 chapters.
https://www.royalroad.com/fiction/50967/anima-academy
Quote:Casimir Toomes has been pretty successful as an adventurer... until he wasn't. With his team shattered and the surviving members scattered to the four winds, he went back to his home country of Anima, and at his Master's behest, became a teacher at the Academy of High Magic.
Sure, his Master keeps bugging him to take on some personal students of his own, but he's not in this teaching gig for good, it's just a temporary thing, as a favor.
There's absolutely no way he'll get attached to any of the brats.
https://www.royalroad.com/fiction/50967/anima-academy
“I really hope I’m behind this convoluted mess; at least that way I’ll be able to get revenge by doing this to myself. I won’t even have to feel bad because it’ll be all my fault.” - Harry Potter, The Master of Death by Ryuugi.