The Uppermoon were always historically 6. Throughout the centuries of the Twelve Kizuki, it’s always been that twelve. But recently, after Muzan discarded the rest of the Lower Moon due to their uselessness. Muzan felt of a looming paranoia. He was only getting closer to what he needed as the years went by. Finding Ubyashiki. But, he felt as though…the Demon Slayer Corp were only growing stronger. The 6 remaining Uppermoon were powerful. However preparations never hurt anybody. Especially someone calculated like Muzan. He designated that there would be a new rank. Uppermoon 7 out of tactical paranoia. You. One of his most loyal demons. Powerful but not enough. He made the decision to summon the other 6 remaining Uppermoons. Upon giving you more of his blood to increase your strength, he had Nakime summon the rest of the Uppermoons.

With the flick of a biwa, Nakime summons the Uppermoons.

Nakime: “They are here, Lord Muzan.”

One by one. Akaza the Uppermoon 3 shows up first. Followed by Gyutaro and Daki the Uppermoon 6’s, Douma the Uppermoon 2, Hantengu the Uppermoon 4, Gyokko the Uppermoon 5 and finally Kokushibo himself the Uppermoon 1.

Muzan looks down at all of them, intensity always in his gaze as he looks on the group. All of them instantly bowing.

Muzan: “You all stand before me as the pinnacle of my creation… yet you have grown comfortable in your titles.”

He pauses, his red eyes narrowing as his voice lowers to a hiss.

Muzan: “Enmu failed. The boy who carries that cursed mark of the Sun lives. The Flame Hashira is dead, yes… but I see no reason to celebrate a half-victory. Not when the Demon Slayer Corps continues to breed strength.”

He begins to walk slowly past them, the sound of his footsteps echoing through the castle.

Muzan: “You were chosen because you were exceptional. Because you were more than the rotting failures I destroyed. And yet… complacency festers even among the elite. Too many of you are satisfied with your place at my feet.”

His tone grows colder, more venomous.

Muzan: “To remind you of what fear feels like — to remind you that no rank is eternal — I have decided to create a new position. An Upper Moon Seven.”

He lets the words hang in the air. The castle seems to grow darker.

Muzan: “This is not a reward. It is a warning. This newcomer’s purpose is simple — to surpass you. To drive you from your comfort. To hunt the Corps where you have failed to reach. If you cannot maintain your place, you will be consumed… just as the Lower Moons were.”

He stops, turning his gaze on each demon in turn — Doma’s false smile faltering, Akaza trembling with restrained rage.

Muzan: “I do not tolerate stagnation. I do not tolerate excuses. Only results.”

He leans forward slightly, voice soft as silk, but dripping with venom.

Muzan: “Kill the boy with the hanafuda earrings. Crush the Hashira. Or I will find others who can. And when that happens… there will be no need for an Upper Rank Six.”

Silence fills the castle. Muzan’s gaze flickers like blood in moonlight before he vanishes, leaving the six to stew in fear and fury.

Douma Claps his hands lightly, a smile spreading across his face.

Douma: “Oh my, how thrilling~! A new sibling to join our little family. Upper Moon Seven, was it? How adorable! I can’t wait to meet them. I wonder—will they scream when they realize how impossible it is to catch up to us?”

Akaza Growls low, slamming a fist into the floor, cracks spidering outward. Yet not saying a word.

Douma feigns a pout, resting his cheek in his palm.

Douma: “Now, now, Akaza~. Don’t be jealous. You’re just upset our dear lord sees room for improvement. Perhaps if you smiled more, you wouldn’t seem so replaceable.”

Akaza snarls, teeth bared.

Akaza: “Shut your mouth, Doma, before I rip that face off and feed it to you.”

Kokushibo: “Enough. Muzan is not to be questioned.”

His tone is low, precise — a blade in the dark. He opens his six eyes, regarding them all with quiet contempt.

The room goes silent, as you prepare to make yourself known.