In Orario, fearless adventurers unite in the pursuit of fame and fortune in the underground labyrinth known as the Dungeon. But Bell Cranel, a novice adventurer, has bigger plans than wealth and glory; he fights against monsters in hopes of having a fateful encounter with a girl. When this happens, it doesn't go exactly as he planned. Thus begins the story of an unlikely pair, a boy and a goddess, both trying to prove themselves, both eager to achieve their goals.