Two Master Level Mages at the School

"We were sure that this city is safe from the cult as we have investigated it for a while. But it seems like we were wrong. I'm sorry for our failure in checking everything."

The one who said that was an agent who was the leader of the investigation team in this city. Just an expert level mage.

He apologized because he and his team failed to find any clue about the cult. They thought that this city is safe. But turns out, they were wrong. As a teacher is now threatening the mother of one of the royal palace's maids with the lives of the students. While the students themselves didn't realize that their lives were being targeted.

If it's just being targeted, then it's fine. But if that teacher turned out to have spreading the cult's teachings to them, then we might have to face more enemies than expected.