Bell Cranell is a new adventurer and the sole member of his dirt-poor guild, which was formed by the goddess Hestia. Adventurers travel from all over the world to the vast labyrinth known as Dungeon, which is located beneath the city of Orario. Bell is more interested in picking up chicks than dungeon-crawling, but he gets his reality check sooner than he thought. Bell falls head-over-heels in love with the beautiful, legendary adventurer Aiz Wallenstein after she saves him from death, but she's not the only woman he's attracted to, for better or worse.