We are taking a break from Izuku and the Hashira to see how our favorite Demon Lord and the his 12 most powerful demons are doing. I know that one big complain that people have with Demon Slayer is the discard possibilities od the Lower Moons, once Rui was killed they were all wiped out with the exception of Emnue. Like I get that Gotou wanted to go straight to the Upper Moons and show how powerful they were. I give Demon Slayer a break because they knew they didn't wanted to overdo it and just go straight to the important parts. This why I respected in the final saga having short but still good pace fights, where My Hero I am already lost on what is happening.

Also, should I made this story M rated because of Demons massacre and gruesome scenes? Also, should I make Izuku with Ochaco or with other girl or with a little harem of 3 girls a la Uzui?

Now lets see what is going on.

On the Infinity Castle.

A portal Dimension created by Demons, this place is a maze of death. If you are caught and send to the infinite castle your fate is sealed. For centuries people were caught by that speel and ended up being devoured by devils. Since it's a place with no suns this was like the home base for all the demons, also the home of Lower and Upper Moons the most power demons of them all.

Right now some poor souls were caught by the infinite castle and were wondering where they are at the moment.

''Where are we?'' Asked a man with a blue skin appearance.

''I don't know.'' Said a woman with elf ear.

''Isnt this the quick market?'' Asked a guy with a bubble head.

''Hey! Where are we?'' Ased a woman with razor teeth.

There was a total of 22 people in there. All wondering where they were, soon their shouts for help and questions were stopped once they heard the sound of a biwa.

BAN

''Uh?'' Asked a woman with a huge tongue.

BAN

''What is that?'' Asked a man with a wolf face.

''I think it's a biwa.'' Said a woman with elephant ears.

''Then where this is coming?'' Asked a guy with long nails.

''There!'' Said a guy with a cellphone for a head.

The group of prisoners saw the person that was playing the Biwa. It was a woman wearing a dark kimono that also had large dark hair that was covering her face. While this was going on they tried to get her attention.

''Hey! Let us out of here!'' Said the man with blue skin.

The woman soon stopped playing the Biwa to announce something.

''He is here.'' Said her.

The prisoners didn't understood what she was saying. Who was here?

''What?'' Asked the guy with a cell phone for a head.

Then a man appeared, he was young and had short dark hair. However this wasn't any man, this was the lord of the demons Muzan Kibutsuji who was looking at those people with no interest at all.

''He is that Michae…'' Asked a woman with elephants ears and those were her last words because soon Muzan used his demon abilities and slaughters all those people and devoured them.

Slash

There was nothing left of those people that were killed, not even their clothes. Things like keys, money and other objects Muzan collected them and sold them online or in some other form to gain some extra cash to sustain his fake identities.

''They were nothing but a light snacks. Attrack more people next time Nakime.'' Said Muzan to the woman.

''Understood my lord.'' Said her

Then Muzan phone started to ring, it was one of his ''wife's''. He liked to pretend to be human to fully explore the world and see what areas he could conquer. His quest was to find a mystical and super rare plant so he could conquer the sun, however the flower was becoming more and more rare to find.

A thousand years and Muzan has never left Japan which is something that he hated. However he promised that once he conquered the sun he would make his reign of demons be spread worldwide and not jus Asia.

Soon he answered the phone to his wife (the same one that Izuku saw the other night)

''Honey, where are you? You weren't in bed so I got worried.'' Said her.

''Sorry, officed called me last minute and I had to go. I didn't even had time to eat breakfast and all they have here is…something that can sustain my hunger. I promise to explain at all later tonight.'' Said Muzan all calm and collect which seem to make his ''wife'' understand.

''oh understood! I will make some nice Yakisoba for dinner dear.'' Said her.

''See you at night my love.'' Said Muzan finishing the call.

This monster has enter the role of ''surrogate father'' countless time and he either abandoned those families or eat them when they find out. This family was with him a few months so he need it to see if they were going to survive or they would be one of the lucky few. Only fate would decided.

''Lord Muzan, the recent portal made by the castle haven't found any trace of the Blue Spider Lily. I am afraid I have failed.'' Said Nakime a bit sad and scared at the same time.

''If you come to me with more failures…I will your skull until it takes days for you to regenerate. Understood!'' Said him all cold.

''Understood.'' Said Nakime scared as she keeps playing.

''Your abilities is a powerful one. I need you around for now and besides I need you to do something.'' Said him.

''What is it my lord?'' Asked her.

Muzan just looked a bit bored as he looks as the documents of his current victims to see what else he could gain with them. While he was doing this he requested something big.

''I request the Twelve Kuzuki to arrive at me.'' Said him.

Nakimi did that and this was something that would only happen every year. She would call every member of the 12 Kuzuki to report their progress to Muzan, it's been decades since they were all together and they would only do that for something big like one of their upper rank was killed which hasn't happen in over 89 years.

The first one to appear was a tall demon with black skin red yes, and drums on his body.

''Kyogai how have you been doing so far in your quest?'' Asked muzan.

Lower Moon 6: Kyogai- His Blood Demon Art is that once he plays the drums that are in his body his environment will change. If he is inside of a room then the room will change locations and even the size if he is playing his drums.

''I have…found more interesting humans to eat. Other than that, I haven't done much progress, but master if you could...'' Said Kyogai a bit shy.

Muzan just makes him go back to where he was and then he went to talk to Lower Moon 5.

''Rui, how is your doing?'' Asked Muzan to a relatively young child with pale skin.

''Mother has been helping me find new food for the upcoming season. We already ate over 20 people that were from a school that decided to go a trip near a territory. Unfortunately no signed of the flower while we were searching.'' Said Rui

''I see, at least you have been improving and getting stronger.'' Said Muzan praising Rui.

''Thank you my lord.'' Said Rui all quiet as he disappeared.

Lower Moon 5: Rui- His blood demon art is related to him being able to make thin threads indiscernibkle from string from his own cells and manipulate them however he pleases. He uses either to slash opponents or use them as puppets.

''Mukago! Report!'' Said Muzan to a demon that appeared feminine and had horns, white skin and red strips on her face.

''Oh master…I managed to lower some people, but they weren't Demon Hunters. Some were lower class heroes if you would like to know.'' Said her all trembling in fear.

Muzan just looked annoyed and sent her anway. He doesn't understand how far this coward was going to last.

Lower Moon 4: Mukago- Her Blood Demon art is related to fear. She can make some type of gas that would make people hallucinate and running away from their biggest fear. She uses this opportunity to lower then and devour them.

''Wakaruba tell me that you at least did something of use this past year.'' Asked Muzan pissed.

''Well my lord I managed to locate a hide out where some members of the Corp were hiding. No hashira, just some random members.''' Said Wakaruba.

''Any demon was spotted near the area?'' Asked Muzan.

''No, all the demon of that area were massacre.'' Said Wakaruba a bit scared.

Muzan just looked annoyed as Wakaruba was soon sent back to his region.

Lower Moon 3: Wakaruba- His Blood Demon Art involves diseases. He can plant diseases in people and once they are weak enough he attacks and eat them. He uses diseases that can transmitted via the air so it can infect his victims way faster.

''Rokuro, did you killed those slayers that were near the Kyoto region?'' Asked Muzan to the other Lower Moon.

''Yes, but not all of them were killed in fact…a large number ran away and the sun was coming out. I am sorry my lord.'' Said Rokuro shaking.

Muzan kept silent and just sent the Lower Moon away, another coward in the msit.

Lower Moon 2: Rokuro- His Blood Demon art was that he could summon a wheel to see how his prey was going to die.

''Enmue, how is your operation?'' Asked Muzan to a young man with pale skin, sharp teeth and a colored hair.

''Oh great! I capture more people to be my dream slaves, soon my lord they would be bowed and doing what I want.'' Said Enmue with a smile.

''You have been optimistic lately. You know that I don't like that.'' Said Muzan pissed.

''Of course my lord…if you wish dispose of me. Please do it slowly and make me feel what is like to die by your hand.'' Said him with a smirk.

Muzan hated Emnue but he couldn't help like his style of handling the situation on the room. If he would have to kill them all he could at least spare him because he was worth something, maybe him and Rui.

Lower Moon 1: Emnue- His Blood Demon Art makes him go control people dream. He can make them sleep and make them stay in their perfect dream world while he devour them.

Soon now that all the Lower Moons were deal with Muzan wanted to talk with his most trustworthy members, the Upper Moons.

''Now, call the Upper Moons.'' Said Muzan.

Nakime used her Biwa and soon the image a young woman appeared near Muzan.

''Daki, tell me how is your new persona?''

''The district is still at full force. It takes some time but I am still the top one around here. All these ugly bitches don't know what is coming near them.'' Said the woman named Daki.

''How many heroes have been in the area? And Slayers?'' Asked Muzan.

''Oh I killed some lower heroes, nothing that would make the news and I haven't seen any slayers my lord.'' Said her.

Upper Moon 6: Daki

Muzan then stop talking to her and decided to move on. He then saw a vase on the other side of the room and decided to speak up.

''Gyokko!''

''Oh yes, my lord!'' Said a disgusting creature coming out of the vase.

''Have you made more vases?'' Asked Muzan

''Oh yes my lord. For you I am going to make as many vases as possible, I have enough to teleport and everything else is for you. By the way I just want to inform you that I had a nice dinner with some children the other night. They were really fun to talk to.'' Said Gyokko smirking with his mouths.

Upper Moon 5: Gyokko

While Muzan was looking at the vases he saw a creature crawling around the infinite castle stairs. He knew that squeaky voice anywhere.

''Oh no the lord has seen me! Please Lord Muzan! Forgive me!'' Said the creature know as Hantegu.

''Hantengu…what progress have you done this year?'' Asked Muzan.

''Well…I killed some slayers…but it was because I couldn't help myself. You know what I am talking my lord!'' Said him.

''Good to hear that. Begone.'' Said Muzan.

''Urhg…thank you my lord!'' Said Hantegu leaving.

Upper Moon 4: Hantengu

Soon someone appeared out of the middle of the castle. It was a young man with pale skin, stripes all over his body, but if he was to appear in today society he looked normal.

''Akaza!'' Said Muzan.

''Yes my lord.'' Said him.

''How are the preparations for the search of the Blue Spider Lily?'' Asked Muzan.

''I have started looking into some restricted area. Places where people aren't allowed to travel, I have a confirmation that it could be there.'' Said Akaza.

''It better be there.'' Said Muzan all cold.

Upper Moon 3: Akaza

''Oh my lord!'' Said a cheery and young voice.

''What is it Douma?'' Asked Muzan annoyed.

''I made a fortune last week. Some rich broads came to my temple seeking help and I did guide them. Into a nice dinner. I got some many jewels and diamonds in one night.'' Said Douma with a smile.

''At least you are having fun while we are doing some hard work.'' Said Muzan pissed.

''I know my lord but it's my style of life. What is the fun of living forever if you cant have any fun?'' Asked Douma with a smirk.

Upper Moon 2: Douma.

Soon a door open and the person that was walking was a samurai, with a purple kimono and six eyes.

''Kokushibo…what is your report?'' Asked Muzan.

''I killed over 100 people last month. 38 were heroes and 23 were Demon Slayers, the rest were all civilians.'' Said Kokushibo.

''Do you have something else to say?'' Asked muzan

''I was thinking on killing the meta liberation army. They are growing more and more, it would be the right time to attack.'' Said Kokushibo.

''Destro was nothing more than a delusional terrorist. Even when I offered to turn him into a demon he chose his ideals, let those fool burn. When they decided to mess around with us…I will be the one to end them/'' Said Muzan all cold.

''Please master…let me handle them. I can kill all of them in one night.'' Said Kokushibo.

''I know you can but it's not the time.'' Said Muzan.

''I will wait on your commando.'' Said Kokushibo going to another room.

Upper Moon 1: Kokushibo.

''Master what else would you like for the others to know?'' Asked Nakime.

''The upcoming demon slayer selection and the next hero exames are also coming soon. There will be new cattle to slaughter very soon.'' Said Muzan all cold.

''When can we kill all the heroes?'' Asked Nakime.

''Patience, one step at a time. First, we eliminate the Demon Slayers and then the rest of hero society.'' Said him.

''Yes lord.'' Said Naikime counting to play.

The Demon Lord decided to use his free time to work on the experiments with the flower. He wanted to conquer the sun and that would be his life goal no matter what.

''another year…another failure.'' Thought him frustrated.

This was just a big ``hey`` to the Upper Moons who are defiantly cooler than the MLA in my opinion. I don't know how I am going to handle both at the same time. I will see around. I wanted to show how the demons are doing before going back to Izuku and his training. Well I hope you all had a great time and see you all later.

YORICHI IS BETTER THAN ALL MIGHT!