The caster with the highest potential

It all bagan over 300 years after day 0. Since then monsters have gradually spread over the surface of earth. In this dangerous word Sho, a teenage boy living by himself, has to fight them to grow stronger. But his simple live soon changes as he gets recruited by a big association. From now on he'll continue to fight strongervand stronger enemies. But what no one nows is the hidden danger lurking in the shadows.