The Bloody Bond of Reversal of Fate When Onimai Senmukai's fangs pierced the boy's throat, Kamado Tanjiro, who was supposed to become a ghost, woke up as a human, while his sister Yadouzi's pupils were scarlet under the moonlight - the gears of fate of these siblings, from then on, they were crushing crazily on the boundary between "ghost" and "human". Forbidden brother-sister symbiosis. The human sister who fled with her ghostly brother on her back tied her loved ones with chains engraved with spells every day. When Tanjiro's ghost pattern showed a triple ring pattern under the moonlight, Midouzi's awakened breath of the moon was in conflict with the Nichirin Sword. The execution order from the Demon Slayer Headquarters, Wu Mei's crazy pursuit, and the mysterious prophecy of the Ubuyashiki family forced the brother and sister into a desperate situation. The combat system that subverts common sense, "Ghost Blood Resonance", allows Tanjiro to temporarily possess Yadouzi, sharing the breathing method while withstanding the backlash of cold poison. From the struggle of consciousness of the "half-ghost" to the awakening of the bloodline of the "ancestral ghost", every transformation into a ghost is a tearing battle between human nature and ghost nature. When Tanjiro's blood crystal suddenly exploded in the Butterfly Ninja's laboratory, the fate of the entire Demon Slayer world was involved in this forbidden experiment.