The Hashira Unite Kagaya reveals Muzan's role in his illness; he was a member of the Ubuyashiki bloodline and the family was cursed as a result of his crimes as a demon. Muzan disregards this and remains confident he will find Nezuko, but Kagaya assures the demon of his failure, unable to see his desire to become eternal pales in comparison to humanity's anger and will to survive. As the Hashira are summoned to the mansion, explosives level the area, sacrificing Kagaya and most of his family to stun Muzan. Tamayo appears and injects a human-conversion drug into him before Gyomei decapitates the demon with his flail, which fails to kill him. Muzan battles Gyomei as the Hashira and Tanjiro arrive, but as they attempt to corner him, Nakime opens doors to the Infinity Castle beneath them. Across the mountain, all active Demon Slayers — including Genya, Inosuke, Murata, Kanao, and Zenitsu — are also taken and trapped inside the castle.