The world has already fallen to the oni before you meet the people trying to take it back. Musashi and Kojiro aren't heroes destined to save anyone, they're kids who picked up cursed swords and decided to fight anyway, knowing the odds are mathematically impossible. You watch them build something real with Tsugumi, three people learning to move together while everything around them proves the fight was over before it started.
Musashi and his ragtag band of swordsmen have claimed their Kitetsu Blades, the only weapons capable of piercing oni flesh. Now they march toward Awaji Island where a catastrophic threat looms: Yamata no Orochi, a colossal serpent Kishin whose very existence reshapes the land itself. The journey forces unlikely alliances as Musashi's crew encounters other bushi groups, each with their own ambitions and methods. Uesugi Tatsuomi commands a formidable force, and their combined strength becomes necessary when facing an enemy that single units cannot hope to defeat. What begins as a mission to strengthen their band transforms into something larger, a convergence of warriors bound by the desperate need to reclaim their world from creature domination. The battlefield erupts across islands and territories, mixing explosive action sequences with genuine camaraderie between soldiers who barely know each other. Humor cuts through the tension, grounding these high-stakes moments in character moments that reveal who these fighters really are beneath the armor and ambition.