Radiant

Radiant manga summary:
Seth is an apprentice sorcerer from the Pompo Hills. Like all sorcerers, he's an "infected", one of the few people having survived an encounter with a Nemesis, those creatures falling from the sky and destroying everything around them. Being immune to them, Seth wants to become a Hunter and fight the Nemesis. But what Seth really wants is to find the source of all Nemesis, the Radiant. Helped by his fellow sorcerers, he will seek the Radiant, under the harsh scrutiny of the Inquisition...