mashle (18 volumes pocket size)

A magical world where everyone uses magic, and the superiority of magic determines everything. In a remote forest, there's a boy named Mash who has become a muscle-training demon every day, and his secret is that he cannot use magic. When someone discovers this secret, his everyday life changes drastically!! For some reason, he ends up enrolling in a magic school and aims to become the top student…!? With his honed muscle strength and power, he smashes all magic in this abnormal magic fantasy, now begins!!