Finale ( probably )

Kens massacre came as a surprise and shock to the Hashiras and the trio. They tried talking to him trying to make him stop but he whooped them all and told them they have 1 month to train and come back to fight him foreal.

Within the month Tanjiro is now the strongest just like he was supposed to be by the end of the manga. Though the others aren't far behind as the micheal Jackson tried making a deal with them saying that if they work with him and his upper moons he'll not only heal Nezuko but all the demons except the upper moons.

They agreed since it's a big profit for them and even after the fight they can still take down muzan and the upper moons.

Ken waited in the middle of a empty space as all their was is grass. The hashiras, trio and demon all came at night since the demons are at their peak at night while human are always at their peak.

As they all approached and hold their swords getting in fighting position Ken slowly got up from his sitting position as he inhales and exhales.

" I'm glad you all are working together, it makes everything easier for me. " Men said as Zenitsu quickly appears behind him using thunderclap and flash.

" This is your weakness for now learning all the thunder breaths. Second form: Rice spirit. " Ken said in a cold voice shocking Everything.

Ken releases five arched slashes accompanied by lightning in quick succession cutting Zenitsus limbs and head all in one go as it angered them all.

Surprisingly the thunder and water old hashiras were here as he appeared behind Ken just to suffer the same fate.

Ken wanted to end this fast so he killed the weaker ones quickly,

" First Form: Thunderclap and Flash - God speed. "

In a burst of quick speed where no one could see him he quickly killed Mitsuri, Kanao, sakonji, Obanai and the rest of the upper moons except the #1.

Now I'm the middle of every surrounded they all used their strongest move they could make.

Shinobu used Dance of the Dragonfly: Compound Eye Hexagon

Muichiro used Sixth Form: Lunar Dispersing Mist

Inosuke used Ninth Fang: Extending Bendy Slash

Gyomei used Fifth Form: Arcs of Justice

Tengen used Fifth Form: String Performance

Kokushibo used Sixteenth Form: Moonbow, Half Moon

Giyu used Tenth Form: Constant Flux

Muzak attacked with his back whips

Tanjiro used Dragon Sun Halo Head Dance

( I think I missed 1 or 2 but pretend they died or something- )

" Heh " Ken chuckled at this as he used the strongest move that exists in this world.

" Sun breathing, Thirteenth Form " using this technique he shocked Tanjiro, muzan and Kokushibo.

Using this move he quickly killed them all as Muzan was the only left with 12hearts left.

Using the thirteenth form again he destroys all the hearts and he gets a notification.

{ Congrats on giving the world its end, since you killed Muzan and the strongest swordsman's the demons would continue growing as there won't be any swordsman's to stop them in time as the demons take over the world. Returning to…}

* fyi I really thought was gonna last longer but when ur so op there's no reason to stretch it out- Sorry😭*

Ken lost his consciousness as he woke up again in the same place he arrived when he died.

" Welcome back, I won't keep you and spin the wheel right now! "

* spinning spinning *

" Congrats you are going to high school of the dead! " God said excitedly.

" I- What the fuck am I gonna do there? How am I supposed to even destroy the world in any way- Without actual powers - Or even being a country's military person it would be hard this is bs! " Ken shouted.

" Now now, don't worry. All you have to do is make it to the end of the anime. Since it was never finished there's no reason to do anything that big. Should last about 3 chapters or more " God said breaking the wall.

" Sigh fine, this should be easy then. I want the best potential in weapons, all Types of swordsmanship's, martial arts and to have the best potential I could have with both swordsmanship and martial arts, I want to have the body that can adapt with it. I want to be born as the brother of the pink head, since they'll train me in weapons and I'll train myself on swordsmanship and martial arts. I want to be the same age as her so make me her twin keep the same appearance just make my hair pink. I want to be put into the body 3 years before canon. Oh, usually in zombie animes, movies there's people immune to zombie infection so give me immunity to it incase I ever mess up somehow. Also just incase I don't have enough time give me the same boost as in demon slayer so I can get stronger faster. " Ken explained.

God wrote it all down while nodding when Ken added more stuff as he finally finished.

" God( me ) that was a lot, alright go have fun. "

* snap *

Ken soon woke up in bed as he checked himself out as he looked good.

Not wasting time he quickly went to his moms and dads room as he broke the door open to get inside.

" Are you crazy Ken?? " His mom shouted.

" I have a few requests. " Ken said to which his mom just got angrier.

" For starters you just started high school and we're already getting many complains. You have no right to ask for requests. " she yelled.

" Calm down honey, speak boy. " Dad said.

* fyi idk if the main characters were actually seniors but ima make them seniors in cannon to make it match *

" I want to leave school for 3 years, I want to be trained in using guns. " Ken said as his dad smirked.

" And what can you offer? Just because we're your parents we don't have to teach you anything"

" If I manage to pass a test to bump me up to senior would you let me? " Ken said to which his mom was about to shout again but his dad stopped her.

" Okay, tomorrow you're taking the test. If you don't pass you'll have to give your all in school and I'll teach you later. " To which Ken nodded and left.

' Good, this will be easy. ' Ken thought and oh how right he was.

( The end he died )