A man in armor with the power of darkness, Ares the Dark Knight, was heading to the Demon King's Castle as a member of the Brave Party. Hoping to defeat the Demon King and make a triumphant return to the hometown of Lulua, the hero's wise younger sister... And in the midst of the final battle, just as Ares delivers a dark blow... with signs of being taken somewhere, out of nowhere something takes you to another world. It feels like you've been caught up in a battle royale, in which strong people from various worlds participate!? To return to the original world with Lulua, who was separated, the dark knight Ares fights. The story of trying to be the strongest in another world begins