Is It Wrong to Try to Pick Up Girls in a Dungeon? Minor Myths and Legends, Vol. 1 (light novel) — Fujino Omori

The city of Orario is a vast metropolis with an underground labyrinth known as the Dungeon. There, adventurers put everything on the line to keep the monsters at bay and explore the unknown! This is where heroes are made and legends are born. Smaller stories can also be found here, and a surprising number of them revolve around a young boy who came to the Labyrinth City chasing his dreams until he met a certain goddess...