Plot:

The story takes place in the fictional city of Orario to when gods all came down seeking excitement, limiting their divine powers to perceive and experience the hardships that thrive on the lower world. Offering mortals to fight monsters assorted in an underground labyrinth known as Dungeon. 

Adventurers visit the dungeon to defeat monsters and take their crystal shards, which are used to craft magic items, among other treasures; however, they can also be exchanged for the world's currency. 

The people of Orario join groups called Familia. The story follows the exploits of Bell Cranel, a 14-year-old solo adventurer under the goddess Hestia. As the only member of the Hestia Familia, he works hard to make ends meet. He looks up to Ais Wallenstein, a famous and powerful swordswoman who once saved his life, and with whom he fell in love. He is unaware that several other girls, deities and mortals alike, also develop affections towards him; most notably Hestia herself, as he also gains allies and improves himself with each new challenge he faces.

Source: Anime News Network