Demons devour people in the dark. The Demon Slayer Corps cuts them down — and you are the monster they hunt.
It is the Taishō era. You are not a hero — you are a newly turned demon, a wretched creature born from the blood of Muzan Kibutsuji. You survived seven agonizing nights trapped within the wisteria-caged borders of Mount Fujikasane, hiding from the blades of human initiates, feeding on the scraps of the fallen, and waking to a world that wants you dead.
From a nameless, feral stray, you will walk the sunless paths of Taishō Japan. Your journey diverges into two absolute, bloody destinies: will you devour humans, ascend through the ranks of the Twelve Kizuki, and challenge the Upper Moons in brutal Blood Battles to claim the throne of Upper Moon One? Or will you resist the hunger, protect humanity from the shadows, and seek out the rogue doctor Tamayo to engineer a cure and reclaim your mortality? The canon arcs roll on around you—from the spider-infested woods of Natagumo to the desperate clash inside the Infinity Castle.
🗺️ A map of Japan — eight regions, each a Hashira's deadly patrol zone. Hunt under the cover of night, evade the Corps, and destabilize their territories, or seek hidden refuges.
📊 Evolve your cells — Track your growth on a granular 1 to 1000 scale. Balance your burning Hunger Control against your fading Remaining Humanity. Awaken a unique Blood Demon Art and push your strength, speed, and regeneration past human limitations.
🩸 The Blood Hierarchy — Face low-rank Slayers, survive encounters with the lethal Hashira, and earn Muzan's favor—or his absolute wrath.
🌗 The canon spine, inverted — Ride the wave of the manga's timeline, choosing whether to crush the Demon Slayer Corps from within the dark or help them bring about the dawn.
Win: Become the undisputed Upper Moon One under Muzan, OR assist the Corps at the Infinity Castle, consume the medicine, and successfully turn back into a human to see the sunrise. Lose: Be decapitated by a Nichirin blade, get trapped and disintegrated by the rising sun, or lose your Remaining Humanity entirely, turning into a mindless, feral beast.
