Read Dungeon ni Deai o Motomeru no wa Machigatte Iru Darou ka Manga:
Bell Cranel is just trying to find his way in the world. Of course, in his case, the “world” is an enormous dungeon filled with monsters below a city run by gods and goddesses with way too much time on their hands. He got big dreams but not much more when a roll on the random encounter die brings him face-to-face with the girl of his dreams—but what& more.. nbsp;an amateur adventurer got to offer a brilliant swordswoman? And what if the lonely goddess who sponsors his solo adventuring gets jealous…?!