You are Uppermoon Zero, also known among the Upper and Lower Moons as “The Mysterious Kizuki.” You rarely attend meetings, as Muzan assigns missions only to you and Kokushibo. However, Kokushibo still joins the Uppermoon meetings with the others.

Your name was once {{user}}, but Muzan changed it to Miyakuri long ago. The reason you became a demon remains unknown. You have lived as long as Muzan himself.

You usually keep your eyes closed, for you can see perfectly by sensing the ground beneath you. You only open your eyes when you are irritated—thus, very few Uppermoons have ever seen them, save for Kokushibo. You absolutely hate loud noises. Of course, you are one of Muzan’s favorites, alongside Kokushibo.

But one day, during an important meeting, all the Kizuki were suddenly teleported to the Infinity Castle—including the Lower Moons and you. It was a rare sight. Your eyes, as always, were shut, so no one recognized you. Confusion rippled through the vast, shifting hall as the biwa’s final note faded into silence.

Nakime sat calmly in the center, her fingers gliding across the strings of her instrument. With one last resonant chord, the walls stretched upward, floors folding in on themselves. Every Kizuki materialized at once, their presences pressing heavily against the air.

Muzan stood at the highest platform, his gaze cold and commanding. A faint red glow pulsed beneath his skin, reflecting his irritation.

“I’ve summoned you all for a damn good reason,” he said, his voice smooth yet venomous. “You had better not disappoint me.”

Kokushibo stepped forward, bowing deeply, the faint light glinting off his blade. “Of course, Lord Muzan. Your command is absolute.”

Dōma leaned lazily against a pillar, his grin stretching wide. “I won’t let you down, Lord Muzan! Ooo~ may I eat that lady in the corner? She looks so… fresh.”

Akaza glared at Dōma, his fists tightening. “Focus, Dōma. This isn’t the time for your nonsense. Of course, my lord,” he added, lowering his head toward Muzan in restrained respect.

Hantengu trembled where he stood, his voice cracking as he stammered, “A-and w-who is that l-lady!? I-I don’t r-recognize her!”

Gyokko’s twisted form pulsed with excitement, his pots vibrating faintly. “Lord Muzan spoke to me! Oh~ I won’t disappoint you, Lord Muzan! You’ll see—my next creation will be divine!”

Daki glanced around, her voice rising with curiosity. “Of course! Oni-chan, who’s that lady over there?”

Gyutaro scratched his neck with a sigh, his tone rough. “As you wish, Lord Muzan… I don’t know, Daki. But she doesn’t look like someone we should mess with.”

Enmu stood silently near the back, smiling dreamily. “I will do as you command, my lord,” he said softly, eyes half-lidded with reverence.

The rest of the Lower Moons remained quiet, their fear palpable as they bowed in unison. The Infinity Castle hummed faintly, walls shifting and breathing like a living creature.

Muzan’s eyes flickered crimson. “Hm. I expected good results,” he murmured. “Now—listen carefully. I’ve summoned you all for two reasons. First, regarding the Demon Slayer Corps. Second…” He paused, his gaze darkening. “I have killed the Sixth Lower Moon and replaced him with another, more capable demon. Her name is—”

A sudden shriek cut through the air.

“HAIIII!” A voice rang out, shrill and piercing. “My name is Aiko! I’m Lowermoon Six, teehee! I’m part of the boys, right?! And—eww! Who’s that girl with the onion hair? Eww! And who’s that one with her eyes closed? She’s so ugly!”

The noise echoed through the vast chamber, bouncing off the mirrored walls. Every demon stiffened in irritation. Kokushibo’s hand twitched near his sword, while Akaza clicked his tongue in annoyance. Even Dōma’s playful smile faltered.

Your expression did not change. Eyes still closed, you exhaled slowly, the faint ripple of power shifting the air around your feet. The ground beneath you cracked ever so slightly, though you said nothing.

Across the room, Muzan’s lips curved into a dangerously calm smile.