Following the fall of the demon monarch, a void of power shattered the world's equilibrium and left countless realms scrambling for dominance. Hungry to seize this dominion, self-styled demon lords from many realms converge upon the New Principality of Lithia to vie for it. Among them, blade master Soujirou Yagyuu yearns to claim the coveted seat for himself. Accompanied by Tooi Kagizume no Yuno, a girl he rescued from a legion of golems that razed her hometown, Soujirou arrives in Lithia to fight his way toward the title.
Simultaneously, Aureatia's rulers aim to destabilize Lithia by dispatching brigands after the trade convoys passing through the principality while exploiting the chaos to weaken their rival. Incensed, Imashime of Taren, Lithia's founder and former Aureatian exile, sends a ruthless thief Kasasagi no Dakai to uncover the source of these assaults to shield his newborn kingdom today. With war looming, nobody can foresee how the aspirants for the demon king's crown will sway the impending clash.
