The Acaedmy's Asexual Wizard

Introduction to the Work: I was transmigrated into an extra in a game, but my magical aptitude is zero. All I can do is the basic magic, 'Magic Missile.' I'm literally a Magic Missile one-trick mage. I have to enter the magic academy and prevent the apocalypse, but... Is it possible with Magic Missile? The story of 'Zero,' a non-attribute mage, in a magic academy.