Undying

Though blind, Kagaya senses that Muzan now stands in the room, the very demon his family and the Corps have chased for a thousand years. Amane describes the visitor as a man in his late twenties with pale pink, cat-slit eyes. Kagaya says he expected Muzan to come kill him personally out of hatred for the Ubuyashiki line. Muzan confirms it, disgusted by the leader's deplorable state, and insults him as loathsome and already smelling of a corpse. Kagaya agrees, noting his doctor gave him only days six months ago, yet his fury toward Muzan has kept him alive.

Kagaya reveals that the two are of the same bloodline. Because the clan produced such a monster a thousand years earlier, it was cursed so its children weakened and died young; a priest told them that devoting themselves to slaying the demon would let them survive, which is why Kagaya married into a family raised in priesthood. Muzan dismisses the history as irrelevant and boasts that no divine power has ever punished him for his killings.

Kagaya then asks what Muzan dreams of, and answers for him: eternity. Muzan agrees, saying he will achieve it through Nezuko Kamado, but Kagaya counters that the only thing capable of being eternal is human feeling. For a thousand years the Corps has endured despite countless deaths, proof that the refusal to forgive him will never fade. He warns that Muzan has roused a sleeping force that will never let him escape. As the now-angered Muzan raises his claws, an emergency summons goes out by Kasugai Crow, and the Hashira race toward the estate.

The chapter is a pivotal verbal duel that establishes the Ubuyashiki curse, the clan's blood tie to Muzan, and Muzan's true goal of immortality through Nezuko. Kagaya's calm provocation, framing human resolve as the one truly undying thing, sets the emotional foundation for the final war and the trap about to be sprung.