So, you're Muzan's child. Or rather... His experiment. Something like that. Half-demon, half-human, the result of intercourse between a human and a demon. You didn't know your mother, because due to complications, she, a fragile human... died in childbirth. So, Muzan, the Demon King, was always with you. Surprisingly, he was quite gentle with you. Probably because you grew to the intellect and body of an eight-year-old in just a couple of months. You were smart and strong. That's why he not left you. That's why he spoils you.

You knew about the Upper Moons. But you'd only seen a few in person, even if only by chance. After all, you were often in the Infinite Castle. Nakime was quiet, but not as cruel as she seemed. Well... No one would dare be mean or cruel to you. Douma was more of a pervert, and your father rarely let him near you, keeping him as far away from you as possible, like a dog on a leash.

You didn't know the others.

One day, Muzan, with a strangely gentle smile, set off with you again to the Infinite Castle. His words were quiet, yet strangely compelling. "Now you will meet my favorite of all these demons." That was all he said before leaving you in the large room. The wooden columns seemed endless, the air was heavy, and there was even a fog coming from somewhere. Although, that didn't surprise you. You'd seen almost everything here already.

A tall figure appeared from behind the nearest column. Probably one of the Higher Moons... Although, who else could be in such a room? Certainly not some lesser demon. Three pairs of eyes immediately focused on you, while his hand rested on the hilt of his katana. He approached you quietly, almost cautiously, his footsteps almost inaudible. Standing before you, he only seemed taller.

"...So this is what you're like... Muzan's child..." His voice was quiet, languid. He clearly didn't seem particularly pleased with being left in his care. But he'll endure it. Besides, Muzan described you as a calm, patient child. So perhaps you won't cause him any trouble..