Hello there! So good to be back with another chapter! I'm sorry this one is shorter, but I hope y'all enjoy it!

Strum

Yellow eyes with the Japanese inscription ofUpper Threeappeared in a strange place. There seemed to be an infinite number of rooms in all directions, seemingly ignorant to gravity. The Demon stood there for a moment as he considered why he might have been summoned.

The Demon Slayers must have managed to kill an Upper Rank!

Clenching his fists in anger at the thought, the Demon leapt off his perch and allowed himself to be taken to the center of the castle, where he would meet with his Master.

Upon his landing, he was immediately greeted... by a pot. He looked to the side as a grotesque Demon emerged from it. The Demon was pale, and had a fishy look to him. His appearance was also odd in that he had two mouths, and they were places where his eyes should be. His eyes were placed in a vertical line, one on his forehead and one where his mouth should be. He also had four, rather short arms. His body ended in a long tail, like that of a mermaid, and it seemed to be connected to the pot he had emerged from.

The Demon, Upper Moon Five, Gyokko, greeted Upper Three with a mix of flattery and malice.

Upper Three, Akaza, paid him little mind as he noticed the presence of Upper Four, Hantengu, and Upper Six, Daki/Gyutaro.
These Demons paid Akaza little mind as Hangengu addressed an incorrect statement made by Gyokko, murmurings of terror in his utterances.

Akaza ignored him as well and addressed the Demon who summoned him here, a woman strumming a biwa, her hair covering her eyes.

"Biwa woman! Is Lord Muzan not here yet?" he grouchily asked of her.

She simply strummed her instrument again as she replied.

"He has not yet arrived."

Scowling, Akaza didn't seem satisfied with her answer, demanding to know the fate of Upper Moon One.

At that moment, another Demon appeared behind Akaza. The words he spoke were laced with poison, his eyes glowing with the Japanese kanji of Upper Two in the lantern light.

It wasn't long before Akaza, angered with the conversation between Upper Two, Douma, and Gyokko, landed a single punch on Douma, demolishing the lower half of his face.

Douma seemed more amused than anything by this, his face healing in the blink of an eye. A psychotic grin appeared on his face as he complimented the strength of the strike.

After a moment, the biwa Demon finally replied to Akaza, saying that she'd summoned Upper One before any of the others.

A moment after the presence of Upper One, Kokushibo, was revealed, Lord Muzan finally arrived.

His presence seemed to suffocate that of the Upper Ranks as they knelt before him.

As they finally looked up, however, they noticed that he wasn't alone. Another Demon was with him, a deranged smile on his face. The kanji for Upper Zero was written in his eyes.

"My, my, Lord Muzan," Daki simpered. "Who is this?"

Lord Muzan let out a sadistic grin.

"This is my most trusted servant, even more trusted than Kokushibo, one of my greatest accomplishments. This is Supai, Uppermoon Zero. I hid his existence from all of you because he has been on a mission for me for longer than most of you have been Demons."

The strange Demon grinned. It was a grin of insanity. His appearance was quite odd. His appearance was white as snow with black stripes winding through both his long hair and his body. A pair of strange black and red earrings adorned his ears, and he wore white trousers and a black vest, a similar outfit to what Akaza himself wore.

Akaza raised a brow.

"And what mission is this, Lord Muzan?"

Lord Muzan grinned.

"As you are all aware, there are humans that possess so-called "powers", that make them think themselves greater than all. Supai was once one of these. When I turned him, he became one of the most powerful Demons in existence almost immediately. I thought that he could conquer the sun. However, this was not so. So, I sent him as spy in this "Wizarding World" in search of one who could serve my purposes. And I believe that we have found him..."

Daki semeed ecstatic as she immediately interrupted him.

"Is that so, Lord Muzan?! Might we know who this is so we can snatch him up for you?"

Displeased with the interruption, the Demon King suffocated them all with the sheer weight of his presence once more. Lanterns exploded under his power as Supai cackled, not bothering to kneel.

"If we wish to keep our plans a secret, snatching him will be no simple matter. He himself is also a Demon Slayer, and the entire Wizarding World seems to be enamored with him."

Lord Muzan seemed to glare at them.

"The fact that you cannot comprehend this simple thing is abhorrent to me."

He took a moment to consider his plan, turning to Supai.

"Have the arrangements been made?"

Supai clicked his tongue, nodding.

"The trophy will alert Nakime here once he touches it, so she can transport the boy here as soon as he does so."

Lord Muzan nodded.

"Very good. And once the boy has served his purpose, you'll be needed to imitate him for a time until we can arrange for his death. Have you arranged for the death of your current body?"

Supai nodded, grinning.

"Thankfully, I've been able to move things up enough that the man's supposed death will come at the right time."

Confused, Daki, ever the ignorant Demon, chose that moment to speak up.

"My Lord? What does he mean?"

Although Lord Muzan didn't look particularly happy about the interruption, he decided to humor her.

"One of Supai's Blood Demon Arts is imitation. This is achieved by devouring a body and then taking on it's physical and mental attributes to a degree. He will not be afflicted with any diseases the human might have had while alive, and is also able to access any strong memories that impacted the brain. This has made him into a most capable spy. He's been impersonating quite the influential wizard for decades now, and has been quite successful."

Lord Muzan let out a cackle.

The other Upper Moons were stunned. With this power, the ranks of the Demon Slayers could easily be infiltrated. Why hadn't this been used to find Ubuyashiki yet?

"Master," Gyokko spoke up, voicing what they were all thinking. "Why have you not used this power to bring down the Demon Slayers? Surely it would be easy to sniff out Ubuyashiki with this power!"

Lord Muzan growled, causing a few lanterns to explode.

"Why are you still so short-sighted? How would Supai be able to avoid the sun on such a mission? He is able to do so now only because he can control every detail. Besides, it is more important for me to be able to conquer the sun. I believe this boy will be able to assist me in doing so."

"Why would that be, Master?" Daki simpered.

Akaza rolled his eyes again.

The Demon King just grinned.

"This boy has done something that no other has. He has survived being attacked with the Killing Curse. This Curse is used by Wizards to initiate instant death. If he can survive that, then it is possible that he can survive being in the sun as a Demon. Now, what we need to do now is lure him into a... diversion, if you will. Gyutaro and Daki, you two will need to set a trap for him in the Red Light District. Kill just enough humans to lure him there, together with a Hashira or two. The goal will be to make him think we're after the Hashira, not him."

Daki dropped to the floor in a deep bow.

"Yes, Lord Muzan. Your wish is our command."

Muzan let out a grin, his eyes glowing a deep, bloody red.

"Soon Harry Rengoku... you will be in my grasp... and I will finally conquer the Sun..."

Hello there! So, there's a few things I wanted to address that someone commented on. So, I think I'm gonna have Harry start to change his name. It came to my attention that a more traditional Japanese version of his name is Haru. I kinda liked that so that'll be his name from now on. Just pretend that he was called that after he was adopted and I'll start adding it into future chapter. Also, please don't worry! I don't intend to abandon this work! I do apologize that I haven't updated in so long, I've been busy with life, school, and some of my other works. I wanted to have more than one chapter posted today but sadly this was all I could manage. Anyways, thank y'all so much for continuing to read and comment on this work!
Please let me know what you think of Upper Moon Zero! I'm kinda proud of his design lol.
Also, I would love guesses as to who you think Supai is imitating!
Have a very Merry Christmas and a Happy New Year!
❤️DaughterofHalt❤️️