Through relentless training, Vice became the strongest swordsman in the world. Meanwhile, the demon Dance spent his days visiting human settlements to summon magic beasts and plunge the people into chaos. The two crossed paths on the battlefield time and again, engaging in “friendly” (?) bickering—a rivalry in every sense of the word. Then one day, a mysterious spell struck them both, transporting them to another world simultaneously. Stripped of the powers they once commanded, they find themselves in a desperate situation—until Dance’s summoning magic suddenly reacts to Vice…?! Even in a new world, their constant bickering remains unchanged. But as they survive one crisis after another, the nature of their bond begins to shift.