The story follows the exploits of Bell Cranel, a 15-year-old solo adventurer under the goddess Hestia. As the only member of the Hestia Familia, he works hard every day in the dungeon to make ends meet while seeking to improve himself. 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.