After struggling to defeat some giant frogs, Kazuma and Aqua seek out members to join their party. They are soon approached by Megumin, a magician capable of performing powerful explosion magic. However, they quickly discover that she becomes incapacitated immediately after casting her Explosion spell and is too stubborn to learn anything else. Reluctantly keeping Megumin in his party, Kazuma is then approached by a crusader named Darkness, who also seems to have a dubious quirk.