A brief description of the manga The Other World’s Wizard Does Not Chant:
A wizard named Yard was unexpectedly called to another world as a hero. But the magic in this world is slightly behind that which was trained by Yard.
You can not rely on the heroes, but you can not go back, which puts Yard in a desperate situation.
Get ready, people of this world, in which the magic is not so strong! The new dark magician Yard will trample your world with his mighty black magic!