Marin Vol. 1 (Shojo Manga)

Hayami Marin is a boy with incredible magical abilities, yet he wishes only to live a normal life and is always trying to avoid training with his grandfather, a powerful and prestigious magician himself. But when an onslaught of horrifying demons suddenly begin targeting Marin and his peers, he must muster what little knowledge he has to try to save the lives of everyone around him. Although it's clear things are becoming far from normal, it doesn't seem like Marin is willing to change his mind...