As an adventurer living in Orario, Bell Cranel becomes the only member of Hestia Familia. Although he was very weak compared to veteran dungeon crawlers, he gained a special skill that enables him to become stronger quickly as long as his feelings towards Aiz, the Sword Princess whom he looks up to, does not change. With the help of his Goddess, Hestia and other people who care for him, he vows to be strong enough to stand side-by-side with Aiz and protect everyone important to him.
As Hestia Familia gradually grows in size, Bell must contend with a number of threats from other gods and their familia , including Apollo, Ishtar, and Ares, all while continuing to strive to catch up to his idol Ais.
Hestia Familia faces an unparalleled crisis when Bell encounters an injured vouivre (dragon-type monster girl) in the Dungeon. . . one who can talk. His decision to protect the girl, who will come to be called Weine, upends everything he and his familia thought they understood about monsters and threatens to put them at odds with Orario as a whole. But Weine is just part of greater schemes concerning talking monsters, schemes which Hestia Familia will soon find themselves at the heart of.