Sore wa Mubou to Iu Mono da.

Louis spent his childhood doing whatever he could to get by in the little village he calls home. He must leave the orphanage now that he's come of age, and there's one thing he wants above all else: freedom from poverty. His best shot at making a stable life for himself lies in graduating from Arneval Academy. If only the tuition weren't so expensive. In need of work, Louis registers with the Adventurer's Guild where he meets Bolt, a seasoned adventurer who insists they form a party together and even helps Louis save up for his school fees. But life at the academy still comes at a price, and Louis finds staying in the party with Bolt might not be so bad, especially as feelings begin to bloom with every new adventure. However, all is not as it seems. Bolt may not be who he claims, and the mysteries of Louis's own past might very well upend everything he thought he knew about himself. Will the truth break their bond, or will it draw them closer than ever?

(Source: J-Novel Club)