~Third point of view~ kokushibo area

As Autumn, the brothers, giyuu, and tanjiro rushed to uppermoon 1 they met with injuried Sanemi and Muichiro. Autumn ran over saving Sanemi from the impending attack Kokushibo was surprised at her speed with her pure anger she ran towards Upppermoon 1. Kokushibo was surprised to see the hashira that defeated uppermoon 2. They both gave their hit, Autumn cutting off kokushibo limbs from time to time Autumn had cuts on her hands and face. As Kokushibo was going to cut Autumn in half Autumn used her sword to block this attack just as Kanao did to Douma in the original everyone was shocked by Autumn's pure strength Autumn jumped up cutting kokushibo head in half this angered kokushibo and started to boost his strength now he wasn't playing around he was not joking with Autumn the others began to Join Sekido use electrical staff to stop hits from kokushibo Kakaru was using a gust of wind trying to slow down kokushibo which was working kokushibo and Aizestu were exchanging clashes. The fight was brutal not showing a winner or a loser yet Autumn used her zodiac breathing to exchange tremendous blows. Kokushibo then said some words "Autumn..." all everyone heard and his voice made everyone frozen in place. He then started talking again...

"Autumn become a demon with a rare IQ and strength you will surpass me in strength refused I will take you by force" This made Autumn terrified The brothers were angry by Kokushibo's words so was everyone else but they were nervous would Autumn give it all up for power. Then a laugh was heard by Autumn which made everyone flinch including Kokushibo "Ha Ha... do you think I'll give up my humanity for power I would rather die for humanity than become a demon and if you loved your humanity you would die brave and loyal swordsman you are crap of a demon..." Kokushibo looked at her then began to reply "what so good about being human you die..." Autumn then answer "that apart of life then you get rebirth as a new person to start over cherish that moment again and how you spend your life not how long you live" Everyone was touched by Autumn words. Even kokushibo cold dark jealous heart felt her warm words touch his soul not realizing he was crying. Everyone was shocked including Autumn but she shook off her shock and ask "Why did you give up your humanity for power?" only word she heard was jealousy. Autumn realized their sibling's jealousy seeing he looked like the doll from the village. Autumn replied, "You don't need to be jealous of your brother did you ever realize you were his moon to his sun?" Kokushibo pounded this for a moment before moving swiftly everyone was worried for Autumn until they saw Autumn met with a hug by Kokushibo. He replied, "I wish I could turn back time to ask for forgiveness from my brother..." The crying Kokushibo said Autumn held out the cure the same one given to the clones "This is your redemption take this and help us defeat Muzan" Kokushibo hugged Autumn one last time the clones filled with jealous rage but Autumn injected the cure making kokushibo human but a demon. The fight ended with the Announcement of uppermoon 1 joining the demon slayer as redemption.

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~Autumn point of view~

The battle with uppermoon 1 ended with him joining us angst muzan we were all running down the long and tough halls until suddenly the Infinite castle started to decay and break down notifying us that they took down Nakime. as My sense of realization kick in I see him... Muzan the demon king my heartbeats were fast and my face was showing pure anger at the selfish king before us without any hesitation I brought my sword up dashing towards Muzan when Muzan look at me I could only see a sinister smile form. I avoid his attack leaving him shocked and then splitting his body in half the other hashira soon joined in Including are new uppermoon allis when Muzan saw kokushibo fighting him all he could say was "TRAITOR!" before releasing a shockwave pushing me and damaging my spine I then hit a wall going unconscious.

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~Third point of view an hour later~

The battle was incredibly difficult but uppermoon 1 and 4s help the battle become bearable Kokushibo notice the sun rising he was about to hide until Aizestu who was right beside him said "Don't the sun can only hurt muzan now" Which confuse him but he listen and trusted Aizestu word. The sun rising was on the edge muzan pushed his old uppermoon down and begin running until he felt his legs cut off Tanjiro was suddenly moved out of the way injuries were cater by zohakuten and Shinbu. Autumn looking at the cowardly muzan trying to flee Autumn used every bit of her strength left Kicking muzan back and then grabbing Gyomei's flail and swinging towards muzan destroying his body and leaving him on the concrete to die in the sunlight Muzan tried his best to escape but ever attempt was stopped by Autumn using the flail she used this method to hold down Muzan until the sun fully rose and ended Muzan for good. Everyone celebrated and cheered the death of muzan Autumn smiled as she finally can live a peaceful life without any fear and could finally view the stars without being afraid finally. Until Autumn felt that she overused her demon slayer mark and started breathing hard Tanjiro notice this calling Autumn's name everyone look at Autumn running over to her Autumn lose consciousness again this time nobody knew if she would awake again... ~Two hours later~ Everyone was healing their wounds Shinobu was catering to Autumn and Uppermoon 1 and 4 turning them fully human. Kokushibo looked at himself and remember Autumn's words and thought to himself "Forgive me lord forgive me... brother". After Shinobu finished with them she went to Autumn still seeing that she was asleep she was able to stable her but it was now up to time and patience to see if she is ever awake to see everyone and sunlight again...