Dragon Forged GN Vol 01 Sword of The Champion
Orin, an ordinary boy who finds out he's the reincarnation of a great hero destined to defeat the evil Fiendlord, teams up with a precocious, entrepreneurial sorceress who's ready to launch Orin's career as the Champion of Draeland-which would be much easier if he didn't keep befriending the Fiends they're supposed to destroy.