Apprentice, Stop Asking! I Really Can't Use This Magic!

Aize transmigrates into the body of a godlike mage, revered by everyone. But he inherits none of the body's memories and can't cast a single spell.

With no other choice, he uses ten years' worth of experience as a broke cosplayer to impersonate the godlike mage.

But worst of all, he's forced to take on five problem students:

A princess whose nation was destroyed, an elf bent on revenge, a demon who has given up on life, a dumb dragon, and a saint with two faces.

Dragon Girl: “Teacher! That crazy woman is fighting Big Sister Elf again!”

Miss Demon: “Teacher, (yawns) that dumb dragon drank the potions in your basement. (Completely unconcerned)”

Saint: “Teacher, I'm scared. Teacher, I'm so excited!”

Elf Knight: “Teacher, could we cover more material today? You've taught me too little. I yearn for more...”

Princess: “Teacher, I want to learn magic that can destroy a country.”

Aize: “...How about we start with Fireball?”

Princess: “Then, Teacher! Fight me in a spar!”

...Maybe you could transmigrate me back instead.

Aize: “Where's that lazy, greedy demon? Wait, where's my staff? Oh no! She stole it!”

After finally getting his staff back from Miss Demon, Aize falls silent.

How... do you use this thing again?

“Teacher! (in unison) What's the incantation for this spell?”

Stop asking, students! I really don't know any magic!