The Mugen Train lies in ruins, but a miracle has occurred: Kyojuro Rengoku, the Flame Hashira, has survived his fatal encounter with the Upper Moon Three, Akaza. To the world, it is a triumph—a victory bought with the life of [Y/N], who cast themselves into the path of death to ensure the sun rose for Kyojuro. But as the wounds on Rengoku’s body begin to heal, the cracks in his mind only grow deeper. Trapped in a golden cage of denial, Kyojuro refuses to acknowledge that [Y/N] is gone. He laughs at the mention of funerals, dismisses visits to the cemetery as a "poorly timed joke," and continues to hold vibrant, booming conversations with the empty air beside him. While the rest of the Demon Slayer Corps watches in silent horror as their brightest pillar fractures, Rengoku remains blissfully warm, waiting for a response from a ghost he refuses to believe is dead. It is a story of a hero who conquered death, only to be defeated by the truth.