Bell Cranel, a wide-eyed rookie adventurer under the tiny, cash-strapped goddess Hestia, keeps diving into the great labyrinth beneath the city of Orario, chasing strength and the sword-maiden Ais Wallenstein who once saved his life. Season after season he grows from easy prey into a name the dungeon's depths have learned to fear. This sixth season continues his climb. Based on Fujino Omori's light novels.