Lord Magear no Deshi

Garu, a mercenary boy whose life was saved by a sorcerer when he was a child, joins a band of knights looking to capture the sorcerer who stole a magical artifact. When the knights find the sorcerer, a battle ensues. What will Garu do in the face of the sorcerer's overwhelming power? A battle action fantasy where sword and sorcery collide!

(Source: Sunday Webry, translated)