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Forget your sins, I will not

Summary:

Kiriya Ubuyashiki and his time before his fateful encounter with Giyu Tomioka.

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Takes place in the same universe as my other story ( A second chance )

I'd suggest reading up to chapter 3 in the first work in this series.

Notes:

I live!

And I’ve also graduated! I would’ve posted this on graduation day, but I was pretty emotional so I decided to post it the day after. Which today was my final day of high school…

It’s so bittersweet. I only really have a few of my friends contacts from this year, but I suppose future me will find new friends in college.

OK… Well, you guys may be wondering why I’ve decided to post a one shot instead of an another part of this series. That’s simple I wanted to get something out to you guys this month. Especially on the day that I graduated high school.

This work is canon to the main story. I already have an outline for the past and what happened in the universe.

Please leave your comments and questions down below. I won’t be doing an authors note at the end. I will answer any questions… Without giving away spoilers.

Enjoy everyone!

PS: I believe it was chapter 5 or six that mentioned 400 years have passed. That was a typo. I meant to write 500 years.

Work Text:

' I will not forget, I will never forgive.' Kiriya Ubuyashiki thought, watching with cold eyes as blood was spilled and blue silken fabric was stained with the crimson liquid. Words tumbled from blood stained lips. The demon raised an eyebrow at one of his dearest friends final words.

Silently he laughs, crazed and filled with a sense of bitter relief. He then stairs along with everyone gathered there as the body fades until there's only the clothes of his dearest friend.

He blinks eyes glowing briefly before they fade.

He promises to be there when they are all eventually dragged into hell. Mainly the one holding the bloodstained sword.

"Run." He says grabbing the blood stained clothing that is now the last remnants of a dear friend.

Once he knows that they're gone he gives them all a deadly calm smile. His Sharp gaze lands on the only one who hadn't spoken, whose face betrays nothing. eyes flash briefly with an emotion of urgency and understanding, with that silent message he turns away. He is unbothered when a blade is sinking into his skin, he bites back the pain filled snarl and replaces it with a growl. Grabbing the blade he rips it from the owners hand.

He stops and brings it down onto the cobblestone pathway and viciously kicks the hilt, snapping the blade in two before proceeding onwards as if nothing had happened.

Out of sight from those who had betrayed him, the black haired demon pulled out a letter from its hiding place, the other balancing the bloodstained clothes.


Soon after he waits a while maybe five years before he sees his extended family again. The demon slayer corps had changed location in the time he was away, which is good because he'd rather not have his bloodline end so quickly.

Kiriya Ubuyashiki watches with discussed as papers and journals are burned away in a bonfire. His sharp eyes catching his name on many of them.

Glaring he wants to sync his fangs and claws into flesh and bone, but he reminds himself that he's not Muzan.

With a final glance he turns away silently stocking through the night. He leaves for the last time eyes glowing. 

He gives a grim smile. "Ah, let my extended family Live... But this generation and three others... I will allow them to suffer. I won't give them relief from... This curse..."


Dark purple plum eyes dance with dark amusement as the owner of the nails digs sharpened claws down a grave stone. 

Kiriya Ubuyashiki stands and examines his handiwork. His hand twitches itching to reach for the blade or fans that he has recently gained through secrecy. It would be so easy to destroy the grave of the one who had essentially betrayed him, and Yoriichi. The black haired demon shakes his head, knowing erasing that bastards name from existence, like he had apparently convinced his relatives to do was enough.

"Hope you're burning in hell... here's hoping I don't see you ever again." He muses walking away with hands behind his head. 

Soon enough two more pairs of footsteps join him. He glances behind him, seeing two older women with a handful of children.

Three daughters and two sons, his memory will live on and not be forgotten.

"Just because he's dead doesn't mean he can't haunt you." States the taller female with soft gentle features.

Kiriya merely shrugs in response and moves on towards another grave followed by the two women and children.

This time he pays his proper respects and leaves behind a candle. A few of his other friends come, leaving behind various offerings.

He lets out an amused snort when a particular friend puts down a bottle of sake.

His hand reaches for the fan and opens it. He feels the metal against his skin and focuses on the feeling. Not on the bitter discussed or hatred filling his chest when remembering the human whose grave he had destroyed. 


Kiriya Ubuyashiki walks into a familiar temple in the early morning hours, eyes never straying from the worn letter held in his hands. Looking up, he absently tucked it back into its familiar hiding place beneath his first layer of clothing.

He does not look around, the memories of his death are still too painful, even though it has been years.

"I won't be coming back for quite some time... I shall be taking one of the blue spider lily's." Letting out a breath he allows for the vision to come as the sun begins to rise. It's of the future he knows, and a fixed point. His face scrunches up in pain. It may be a fixed point, but for some reason, it is shaky, fuzzy at the edges even.

"... This family refers to your blessed flower as Sujin's tears... " he breathed, barely above a whisper, tears that taste like blood falling down his pale cheeks.

He picked a flower and walked away. just as the first race of the sun pierced the quiet temple with its warm presents.


Kiriya Ubuyashiki wants to throttle someone, mainly the six eyed demon standing below him unaware of his presents. He wants to call down and say what an idiot he was. At the same time he wants to burst out laughing because by the Kami was this ever hilarious! 

Who knew faking someone's death could be so fun to watch. Then again, he's worried on how hard it must be for his friend below. After all pretending to be dead in front of your own brother wouldn't be easy.

He winces when the body is cut into pieces. He almost falls off his perch atop a roof when he sees two wooden halves of a flute being picked up and pocketed away. This is the most care he's ever seen this demon do in the short time he's observed him.

He holds his breath not daring to breathe as the demon below him disappears. Jumping down he calmly walks over to the corpse and pokes it. An eye opens and the body puts itself back together. Blind eyes shift back to clear maroon ones, wrinkles fade and white hair returns to normal.

"I'm sorry."

"His youngest son and I are still alive, we will free him... I don't blame you..."

"... Thank you and you shouldn't blame yourself either. After all it won't do good for your lover, descendent or student if you're continuously placing the weight of the world on your shoulders..." he knows his friend will have a student one day, but that is all he knows. His visions haven't granted him a name, face, nor any discernible features.

A barely perceptible smile is his only answer.


Kiriya Ubuyashiki blinks several times pretending as if he is trying to comprehend the story that he was just told.

Throwing his hands up into the air he gives an indignant huff. "Well damn... Fine, fine I'll help you look for him, but if you think that I will leave this building without an explanation on how your blood demon art works then I swear by all of the Kami above..."

"All right all right!" Cries the other demon throwing their hands up in surrender. "... Just... Could you please turn my father into a demon...?"

The request is hopeful and hesitant. He can feel the warn letter pressing against his chest.

He turns his attention on to the prone form of the human before standing and making his way over. 

From within his inner pockets, he pulls out a flask of blood and opens it beginning to pour the red substance down the mans parted lips. His distant voice fills the silence of the room

"...You and I know I'm mearly a representative... you will know when the time is right..."

Quickly, he opens the man's closed eye and sees a glowing kanji Number. Letting the eyelid close, he decides to tell his friend this tidbit of information later when the man before him wakes.

The figure crosses their arms unaware of their friends thoughts and gives the smaller demon a meaningful glare. "And how exactly will we know? "

Holding up the now empty flask Kiriya grins. "... I never said I was the one turning our friends into Demons... Let's just say this blood is very unique. Simply putting a drop of my demonic blood has kept it fresh." 

"Ooh, I hate it when you do that! And what do you mean by unique?"

"But that would be spoiling the surprise." He gives his friend a mischievous grin.

"Aww, fuck you!"

"Thank you."

"UGH!"


Kiriya Ubuyashiki stretches, looking at the two dozen graves before him. Letting out another drawn out sigh, he walks over towards the ruined temple.

Another night of burying human remains. A part of him wished he could've drowned in his thoughts of the past.

Dropping the shovel at the entryway he walks inside and knelt before the demon he had just turned not a couple of hours ago. 

He blinks in surprise seeing the once unconscious figure now standing, dried blood, staining their clothing.

"Ahh, you're awake." he says, not showing any hint of shock as he examines this new demon up and about. So soon after their transition into Demon Hood.

"Don't worry, I'll stay with you for a good while. Will you be all right once I leave though?" He questions gazing at the tiny demon.

"Yes... Mirai will be fine..." whispers the 3'2" demon.

He smiles in relief. "Good, now let's see about teaching you the history of demons. After that, let us see what your blood demon art is, shall we?"

The small demon—child— nods vigorously as their eyes glow before fading. He blinks having just caught the kanji for six flash briefly in their eyes.

'Ah, another one, thank goodness.'

He supposes burying the dead, was better than drowning in his complex thoughts of the demon slayer corps. 


Kiriya Ubuyashiki grimace's at the pain of his back stitching itself together. As he stands from his slumped position he let out a string of curse words underneath his breath. 

He had forgotten how painful it was for his spine to break. He only wished he had gotten hit on the back of his head because then he wouldn't have to pretend to be unconscious while having to stay still through the agonizing pain.

then again hearing the demon kings name being damned thrice, was worth it.

Walking over, he gently scoops up the infant from the unconscious demons arms, and looks around. Sniffing the air, his eyes widen briefly before a snort of amusement escapes his lips. 

"... I will bring him and I will not say your name." He states knowing Yoriichi's caution in revealing his name before being introduced to someone in person.

A sudden gust of wind envelops the clearing before it fades. The snow around them falling into various clumps. He blinks and briefly catches a flash of red disappearing off in the distance.

He slumps still holding Yoriichi's last remaining human descendent in his arms. Muzan was really pushing on his last nerves! First, it was that bloody preserved journal of the old water Hashira. The contents within said diary of his inherited memories and how the flower was fully used to turn Muzan into what he was today. Or how the water Hashira decided to use the flower on himself, just on a smaller and less noticeable scale.

Then it was the creator of breathing styles bloodline nearly ending by the very bastard he and many others wanted dead. Oh, and he definitely could not forget this Hashira—fucking Tomioka—having become a demon by the bloody Demon progenitor!!

'Dammit all! ... At least you took it at the age of seven... the demon slayer training is good for something after all...' He mused.

Continuing to quietly stew in his anger at the Kami's, the fucking demon king and his life in general, he addressed the old Crow.

" I am here to help... Your master said Muzan Kibutsiji's name... twice Therefore, his cells should've destroyed and killed your master on the spot..." he fights back the grimace, memories of seeing a few demons foolish enough to have said the demon kings name when baiting them into saying it. "... And yet, I'm still speaking, not dying an agonizing gruesome death... I despise the demon king with every fiber of my being. I will help..."

The old crow shifted from left to right then he flew up and made eye contact with him. He allowed for a few of his meticulously constructed walls to fall briefly. Once the crow seems satisfied, he was telling the truth the bird landed in a patch of snow, waiting for his master to wake up.

He swiftly rebuild his mental shields.

Looking up at the sky Kiriya Ubuyashiki cannot help a grin from forming. It might have taken longer than he had expected, but his plans... His promises were slowly coming to fruition.

It wasn't over... His plans were just beginning. He would live to see the downfall of the demon king. His family would be free from the curse that had been plaguing them long before he was even a thought.

Wrinkling his nose, he looked down at the bundle held close to his chest. "Right... Let's get you changed..."

His eyes narrow, piercing the cloudy sky above. His heart twisted with a familiar ache, as he went down the mountain towards his sack of supplies. 

His next words were cold and shook with bitter rage.  

It might have been 500 years and even longer since Muzan Kibutsiji was reborn as the demon progenitor, but the pain of betrayal, along with many other mixed emotions were still there. However, if there was one thing for certain in Kiriya Ubuyashiki's mind it was these simple words.

"Forget your sins, I will not."

The letter ever hidden rubs against his chest.

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