A Misanthrope Teaches a Class for Demi-Humans

I hate humans.
Rei Hitoma, a former teacher in his late twenties and now a NEET, carries deep trauma from past interpersonal experiences.
One day, a job listing catches his eye:
"We are seeking a teacher who truly cares for their students."
Despite swearing he'd never teach again, those words push him to apply on impulse.
Before he knows it, he's passed the interview and is hired by a school deep in the mountains, surrounded by nature.
But the school isn't for humans. It's a place where demi-human girls study in hopes of becoming human.

A mermaid, a werewolf, a rabbit, a bird... Why do they want to become human? What do they admire in the very species Rei despises?

This isn't an isekai, nor a reincarnation story.
It's a unique school-life "human" drama about one reluctant teacher and the demi-human girls who long to understand humanity.