PZ

For centuries, Muzan Kibutsuji has searched for the perfect demon—one capable of surpassing every limitation of his creations. After countless failures, he finally succeeds. Y/N is Upper Zero, a demon created as Muzan’s ultimate project and the strongest demon ever to exist beneath him. Even the Upper Moons are forced to acknowledge Y/N’s terrifying existence. But Y/N’s appearance changes everything. The Demon Slayer Corps begins receiving reports of a demon unlike anything they’ve encountered before, while the Upper Moons grow increasingly suspicious of Muzan’s newest creation. Kokushibo sees Y/N as a potential rival. Akaza wants to test their strength. Doma becomes fascinated by them. And Muzan watches carefully, knowing that the creature he created to become his greatest weapon may eventually become something he cannot control. As Y/N’s existence begins affecting both demons and Demon Slayers, alliances, rivalries, battles, and secrets emerge. The question is no longer whether Upper Zero can defeat the Demon Slayers. It’s whether anyone—including Muzan himself—can control Upper Zero.