Akashic Records of Bastard Magic Instructor Vol. 3 (manga)

If there's one thing that bothers Glenn Radars more than having to work, it's having to work on an empty stomach. Luckily for a broke magic teacher, the Imperial Academy is staging its annual all-class tournament, and the teacher of the winning class stands to take home a massive bonus. Pocketbook running low, Glenn will put forward the one thing he can't stand more than anything else: effort. Now that he's got his eyes on the prize, the rest of the school had better watch out -- he'll turn a team of underachievers into the fiercest band of mages the Academy has ever seen!