The biwa's notes heralded disaster.
Nakime held a biwa in her arms, her loose hair covering most of her face. She was Muzan Kibutsuji's female secretary.
Her Blood Demon Art allowed her to manipulate space by plucking the biwa.
Its specific manifestation was the ability to summon an "underground city" with no distinction between up, down, left, right, east, south, west, or north—a city also known as the "Infinity Castle."
By plucking her biwa, Nakime could forcibly summon all the Twelve Kizuki into this city.
Ding-dong!
At the sound of the biwa, several Lower Rank demons among the Twelve Kizuki suddenly discovered that they had been summoned into an enclosed, spatially distorted "maze."
The maze was filled with stairways and corridors. Even stranger, there was no distinction between floors and ceilings.
Lower Rank Six Kyogai saw with his own eyes a demon standing upside down across from him.
Kyogai was not the only one. The other Lower Rank demons were also thrown into a panic.
To become one of the Twelve Kizuki, each of them had been exceptional among countless demons.
Yet being summoned in such a manner left them all terrified, their hearts in their throats.
Had something major happened?
Why had Lord Muzan suddenly summoned them?
Ding-dong!
Another note rang out from the biwa, and the Lower Rank demons, who had just been scattered throughout the Infinity Castle, all appeared on a central platform.
The demons all stiffened. They were the Twelve Kizuki, yet within this city, they could not even control their own movements.
It was simply too terrifying!
Then, to their horror, they saw a very young boy standing before them, seeming no more than sixteen or seventeen.
The demons were all bewildered. Who was this boy?
How could he so openly appear before them?
Then