Ayashi no Hakoniwa ni Ukabu Tsuki

Shuri Yuuki, a high school teacher forced to resign from the school where he was working because of a certain incident, is assigned to a new post at Karasudai private school. On the first day in the new school, he tried to save a bird from a dog's mouth but the dog transformed into a demon instead. What else is going to happen in this school for wild students who are not human?

(Source: Futabasha, translated)