Good luck, demon king! manga

Good Luck, Demon King! summary:

This is a wonderful world ruled by magic. It's full of ancient myths and legends of all types, including one such legend that was on most people's tongues as of late: one about the battle between an evil demon king and great sages. In the current day, at the world's one and only Magic Academy -- the Forest Academy of Magic -- more and more odd creatures seem to be appearing and causing trouble. In the middle of it all, there always seems to be the shadow of an academy student named "Salaman"...