Witcher Codename Lurking

Two of the strongest demon hunters... Came to be teachers in a school? The ruins of "The Dance of Demons" are covered by a large academy. People's ignorance has caused innocent children to suffer mental and physical harm from demons. Demons that have already broken through the physical restraints possess the weak children, and the hearts of weak-minded children... Two numb demon-slayers killed demons on a battlefield they were unfamiliar with and gained spiritual salvation at the same time...