This Manga: Let's imply that magic is an artificially created phenomenon, with restrictions, via prime numbers.
Also This Manga: It's ok that an amateur mage can just delete parts of the world, due to "lack of mastery".
You would think a failure, would just prevent you from being able to use the spell at all. The world building of this manga is such trash. Is this all just going to be troupes and cringe from beginning to end?