Teihen Senshi, Cheat Madoushi ni Tenshoku suru That Second-Rate Warrior Is Now an Overpowered Mage!

Synopsis

"I need you!" Lars, an adventurer warrior, was always treated as the errand boy by his party. His life changes forever when his party kicks him out, forcing him to change jobs. It is then discovered that Lars has an overwhelming talent in magic rivaling that of the "Great Sage"! Friends, adventure, and perhaps...love? A new career with abundant talent! (Source: Square Enix)