Kimetsu no Yaiba does not belong to me but to Koyoharu Gotōge ... I only do this for fun and hobby
Warning: This is an AU. I think there is a slight Out of Character, don't blame me! I'm new to fandom.
There are also changes with the manga canon. The fanfic in its initial chapter is located in the events of the arc of the Infinite Train, specifically in the fight against one of the upper moons since it is from there that the development of this fic begins.
The fortress of the powerful Muzan Kibutsuji urgently receives the lower moons ... well, it received since, due to Rui's death, he chose to dismantle that lower group that has only brought him disappointments. Only 1 could survive from which he not only gave him some of his blood but also gave him the mission to destroy a Hashira
When he decided it was time to leave, at the last minute he took the body of one of those pathetic moons to take him away. Once in the garden of his house, a couple of voices welcome you with joy and respect.
"Welcome back" Say two young people with long hair tied to a high ponytail and dressed in simple kimonos but that, due to the darkness of the night, you cannot observe the colors.
"It's a surprise that you two are here. Usually I always receive one of you" Muzan responds neutrally.
"We sneakily watched the meeting, it was a worthy spectacle that you ended those obsolete beasts" comments a young female with black hair.
"Rui was not obsolete, he was worthy of climbing and becoming one of the Upper Moon. It hurts me that those slags of Demon Slayers destroyed him" A black-haired young man claims as he sighs in sadness at the departure of the spider demon.
"My children, what did I tell you about spying?" The scolding voice in Kibutsuji shakes both of them.
"Spying meetings dad / father's bad" Respond both with a pout, from which provokes laughter to the adult.
"By the way dad, I love when you take the form of a woman. How I would like to have that beautiful appearance."
"But you are a beauty, sister."
"What that boy said didn't help much" The girl's look is disappointed, causing her brother a fury.
"Grrr I swear that when I see him again he will be very sorry."
"Ahem ... if you want to complain, better do it later. I brought you something" He throws the body of the failed lower moon near them. He loved seeing the sparkling eyes of his children as they delight in devouring their former follower.
For his followers and even himself, it was very strange to him how his children preferred to eat their kind rather than humans. He recalled the many times he forced them to eat so that in the end they failed, and it was not only him but also the upper moons who used many methods so that the brothers could eat something of those humans and the results were not favorable so they surrendered and they chose that for survival it was to replenish energy when sleeping (which at this point, both parents and the rest find it difficult to understand). It was not until later on a mission that they accompanied him, which consisted of ending a hunter and incidentally (without wanting to) rescued a demon so that in the end, he was a victim of the appetite of his children ending the existence of that being that only fulfilled its role: to be their food. It is ironic that they were both demons and fed on their kind, so Muzan decided that on whatever missions they were, he would give permission for the two to satisfy hunger with any demon idiot who dared to meddle with the pair.
"It was delicious, we needed something to regain our strength after that fight" says the eldest of the brothers.
"How are you doing with the mission?" Kibutsuji asks (already in his original form) as he sits on a bench, being accompanied by his children sitting on the grass.
"The mission was almost in compromised, the pillars almost revealed us but the kindness of some allowed us to continue and get rid of suspicions. But we cannot let our guard down at this point" The girl speaks respectfully, as if her cheerful personality is It will disappear instantly.
"Tsk ... I think the best thing is to unsubscribe them in that dangerous mission."
"Father, we can do it. We have the confidence of at least 2 pillars and your biggest obstacle."
"I see," the man sighs in annoyance at listening to the boy.
"Also, soon we will go on a mission and a pillar will be there."
"A Pillar ? What mission will they be? " As the information was revealed, a crooked smile adorns the plum-eyed man.
"I see. I have no other choice but to encourage them to continue with their goals" Kibutsuji gets up so he can enter his home while saying goodbye in silence.
"We will not fail you, Muzan-sama" Say the young people as they bow to the most powerful and feared by humanity and demons.
1 week later
The Flame Hashira struggles not to fall into unconsciousness due to the severity of his injuries. The fight with one of the upper moons was an odyssey because of the difference in power, strength and agility. Never in his years as a demon slayer and as a pillar did he reach a critical point; he had to accept it: Beating that upper moon is a difficult task even if he is a powerful slayer.
The young slayers have mixed feelings, they want to support their superior but at the same time they fear for their lives due to the abysmal difference of what they possess versus that vile and powerful creature. Kyojuro Rengoku wanted to protect them but he could not take the risk if he took a wrong step for that evil being to attack the boys, so he decided to use all his remaining forces to finish off Akaza immediately.
As he moved, he saw Zenitsu and Inosuke fall into unconsciousness as a result of the blows from the demon girl who is familiar to Tanjiro. The named also notices and tells her to move the boys away from the battle zone so that they are safe and sound, something that the female captures and complies with the order.
The blonde asks the boy to move away so that he is safe, he hears the footsteps so he intuits that the Kamado paid attention to him. "It is the best", was his thought and reassured him that there was no danger to anyone, so he decided to strengthen his movements to defeat the enemy, however ... fate has something much worse in store for him. He feels like out of nowhere he freezes and falls without the possibility of moving a muscle.
"What's going on?" He wonders, he did not know what that paralysis was due to, he is supposed to be injured but it was not that the energy of his body stopped abruptly, perhaps ... That upper moon is the cause of what what happened
Akaza didn't understand what was happening, how the hell does that powerful rival fall like an insignificant rock out of nowhere? He decides to focus his gaze to find the source of the interruption and finish it by having stopped that conflict. Before continuing with the search, listen to the sound of a biwa and quickly find yourself in a place well known to you.
"Why are we here?" Asks the upper moon with pink hair, since she knows that when the twelve moons are in that rustic place it was only for something: The fall of one of its members. But none of the upper moons has been the victim of a cruel end except for the recent death of the lower moon one.
"How strange ... I don't see the other Upper Moons" It was true, there was only him and that Hashira in that place. Rather, since when is the entry of humans / demon slayers into the fortress ?, doesn't make sense.
"Actually, it wasn't me who called you to be here." A deep and imposing voice echoes through the place, freezing the Rengoku's blood and alerting the pink-haired demon, the monologue of that continuous voice.
"Someone else asked Nakime so that you were here including that pillar and incidentally, request my presence urgently."
"That is ... impossible" The gaze of the Flame Hashira is fearful since it is the first time that it is present before that being, the main reason for demon slayers.
"It's the first time that a pillar has met me, but unfortunately it will be the last time."
"Muzan-sama, if you allow me ... let me end this being."
"This time you will not Akaza, since someone will take that role."
"Someone else? One of the stupid moons?"
"No ... someone you know, and the reason why we are here."
"I must get out of this situation before it gets worse" was Kyojuro's thought, although as much as he tried, his numb body prevents him from making a movement to get out of the mess, the chances of getting out unscathed were reduced to zero since not only he is in a serious state for facing a Superior Moon but he is also facing the cause of the misfortunes of the members of the organization to which he belongs. The tremor makes his body visible, he had to accept it: The aura that Muzan radiates was impressive and he recognizes that ending it to end decades of suffering is an impossible task that he or a pillars could perform.
"Muzan-sama ... I'm sorry I brought you to the fortress but, I would like you to see the end of this pillar in person" The soft voice of someone who was familiar surprises the blonde with red tips. He tries to turn to see the source of that voice but the numbness of his body was impossible.
"That voice ... Is he here? Did it cause that guy to stop moving and bring us here? " Akaza was able to pull the strings together to discover the cause of the situation.
"I'll let it pass this time. That lower moon that I let live did not keep its word" Kibutsuji responds with a petulant voice.
"That is why he sent me to complete what that useless man did not achieve. I didn't think you were in the middle of this" Akaza comments with annoyance at giving up since he will not be able to give the final blow to the pillar.
"Are you the one that caused the paralysis in my body and they brought me here? That guy's voice is ... it can't be" Kyojuro's breathing is becoming heavy due to the situation he lives in.
From the shadows where they are located emerges a young man with tanned skin, burgundy black hair with a red mark on his forehead, dark red eyes and dressed in a checkered black and green haori. A person Rengoku knows perfectly and his mind is filled with thousands of questions.
"Tan...jiro?" The user of the flame breath murmurs in shock.
"So is. Welcome to the Dimensional Infinity Fortress, Kyojuro Rengoku" He replies with his typical smile.
"I don't understand. What are you doing here? How do you know this place?"
"It's because this place has been my home for 5 years."
"You home? Did you?" The evil smile provided by Tanjiro was the beginning of what would be his end.
A reddish light in the form of fire surrounds the user of the water / sun breath and it took a matter of seconds for his appearance to change completely. His hair is lengthened until reaching waist height and tied by white ribbons in a high ponytail whose burgundy red tone is more dominant in the rebellious hair, the clothing consists of: A kimono on the top of 3/4 sleeves red color with some white accents as well as a black hakama, he still wears his Nichirin Blade on the right side of his waist and does not wear sandals; The face is denoted by black / red gradient marks in the form of flames that runs from his forehead on the right side of his face to his chest. But what is most noticeable in Tanjiro are pale skin, bright red eyes with vertical pupils, fangs and nails or rather sharp claws ... he never thought for a second that an ally who even proposed to be his disciple was actually the enemy in all this time.
"You are ... a demon" Rengoku whispers in a broken voice.
"So is. It was a good idea to infiltrate their organization to destroy them from within and now, you will be the first pillar that will perish for us."
"Infiltrate us? Is there another traitor?"
"One that you wanted to finish before my eyes. And it is something that I will never forgive them" Tanjiro's voice was of pure poison, causing a chill in the user of the breath of flames who opens his eyes after understanding the words of that traitor.
"You realized it, right?" The mocking smile that young Kamado made alert in his person.
In the landscape where the demon train derailed, a pink light disappears showing a girl with long black hair with vermillion reflections and tied to a high ponytail with black ribbons, pink eyes with vertical pupil, sharp claws, pale skin and dress of a short kimono up to the knee height in pink tones with a white print, accompanied by a black haori and without wearing any footwear. There are black curved marks on his face both on the cheeks and on his forehead and he is adorned by an arrogant smile where his fangs are visible. She drags 2 unconscious blond-haired youths and a wild boar-headed user.
"How I wish annihilating but disobey my brother. At the least he can eliminate a pillar while I have to be nanny these guys. That envy ... Hopefully, Dad will be pleased to observe the implementation of that pillar."
Zenitsu and Inosuke were unaware that Nezuko was a traitor along with her brother for the eradication of demon slayers. Kyojuro barely had the newly acquired knowledge of the male Kamado and to his dismay, there was no way to report that information to his companions.
"That demon girl, is the other traitor. Your sister ... Will she kill those boys?"
"I wish I would, but for the success of our mission, we must let them live for now. Instead you, will take our secret to the beyond."
"Not if I avoided it ... arg-The pink-haired demon hits him to silence him."
"Shut up disgusting human. Have more respect for Tanjiro-sama."
"Tsk ... your family should be disappointed for what you are, you have dishonored the last name Kamado" Rengoku misses you upon hearing the mocking laugh of the long-haired boy, he looks at Kibutsuji who adorns the face with an arrogant smile and victory.
"Humans are very naive and easy to fool. That is why the infiltration was successful, because we used a false appearance as well as changing our identity."
"That means...?"
"My name is still the same, but last name is different. Kamado is false, one that I use as a "human" identity ... my real name is Tanjiro Kibutsuji."
"Kibutsuji? You are...?"
"Yes, my sister Nezuko and I are adopted children of Muzan-sama."
"The children of our greatest enemy ... it cannot be. We are lost."
The boy bends down and smiles gently at him as he takes the chin of his victim to admire him, he was fascinated to smell the desperation of his prey before crossing their bodies and admire the disappearance of that shine from their eyes.
"Say your last words," he whispers gently. For Kyojuro, it sickened him to see that boy in his true essence and how sadistically he treats him just like that human side with which he began to become attached. It hurt inside him how his life would end and leave his brother and father.
"Brother, father ... I am sorry to make you suffer in solitude with my death."
"If you had accepted my offer to join us, this would not have happened," Akaza says with regret as he witnessed the execution of that rival.
"I think my father wouldn't have accepted if you did. Or am I wrong?."
"Who knows ... a Hashira like a demon would have been interesting to witness. Tanjiro, give him the test."
In silence, with his claws it pierces the torso of the Hashira while whispering "Sleep well", out of the corner of his eye, he observes how the brightness of Rengoku's life fades as well as listening to his last breath while declaring aloud, the fall of the user of the flame breath. Muzan smiles contentedly while the upper Moon 3 is surprised to witness the execution of that human who rivaled him.
"Tanjiro-sama ... I thought you would make him a demon."
"You thought. From what little I knew, he prefers to kill himself than to become one of us. If he had given my blood, he would have two options: commit suicide with the Nichirin knife hidden in his clothing, or resist and be annihilated by the same blood. So choose to end his life even though ... because of the severity of his injuries, he would not survive even if the doctors cared for him."
"You and your sister have done a good job" Kibutsuji goes down quickly to caress the reddish black hair, making the boy shudder happily and kneel down in reverence to answer him with respect.
"It is an honor to serve our father and lord. It's a pity that Nezuko is not present to receive the words and caresses of our father."
"Go with your sister and rest. Don't raise suspicions and continue with the mission."
"It is understood. If you allow me, I will take the body of the pillar so that the slayers do not suspect us."
"I grant you" In an instant, he was no longer in the fortress but was teleported to the place where that train derailed and there are traces of the passengers. He looks at his hand and notices that he now has his human disguise, although the only thing that remains is Kyojuro's blood, so he decides to clean himself with the clothes of the Hashira.
"You came" Tanjiro turns and sees his sister leave the forest in her true form with that wooden box that she uses as a refuge.
"How about those idiots?"
"In a little while they will wake up. I will have to get into that box since the sun is about to rise" She sighs annoyed since part of the deception is pretending that the sun hurts her as well as using that bamboo in her mouth.
"Father congratulated us and advised us to rest" That news instead of making Nezuko happy, caused him annoyance and envy, which his brother noticed.
"Lucky one. I wanted to be there but I had to babysit those guys."
"Hold on a little longer, soon our lie will end." She hugs him fondly while advising him in a whisper to wear the costume, something she does and gets into the box to close her eyes and rest.
In that second, Zenitsu and Inosuke regain consciousness and hear someone's sob. To get up and look for the source, they find a scene that freezes them: Tanjiro cries disconsolately in front of the lifeless body of the Flame Hashira. Both the blonde and the one in the boar mask do not know how to react because they were out of combat and they do not know the cause of the fainting.
"Tan... jiro ... perhaps Rengoku-san ..." whispers the user of the lightning breath in shock.
"Tell me it's an illusion ... that guy is very powerful to end it like that" The user of the beast's breath tries to be in temper, refused to believe that the man whose scale of power compared to his is superior , had a cruel ending.
Tanjiro smirks and is relieved that his "friends" are watching only his back. Turn his face so that they can observe the mask that you have created specifically for slayers.
"I couldn't ... I'm sorry ... I was weak" The tears that fall like waterfalls makes the lie become more powerful.
Soon all the slayers learned of the sad departure of Kyojuro Rengoku, of which some mourned him and others mourned his premature death. For the Kamado brothers, they are relieved that their secret remains secretive and they even had great fun due to the ignorance of the vast majority of its members.
The demon slayers are unaware of the secret that Tanjiro and Nezuko carry in their blood, and that their impending destruction would bring. The days of the corporation are numbered and there was nothing and no one who can save them.
TO BE CONTINUE
A pleasure! I'm new to the Kimetsu no yaiba fandom, I became a fan of anime and I'm reading the manga and to tell the truth, this is the second mangaka that I'm afraid of ending up with beloved characters, the first is Yana from Kuroshitsuji and now the mangaka from Kimetsu TuT
The story will have 4 episodes, I'm already going through part 3.
I forgot to mention...ah! yeah!
Taisho Secrets!
-In this story, the brothers refer to Kibutsuji in two ways: Tanjiro tells Muzan as a father since he respects and admires him in silence. Nezuko calls Muzan as dad because she loves him too much, although sometimes her happy personality changes to a serious one and she calls his dad as lord.
They both know perfectly well that they are children and also subordinate of the Demon Progenitor so don't be surprised if they call him as a Master or just Muzan-sama
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The other thing is that if you notice, English is not my main language. I speak in Spanish but I manage English because I'm studying that language. In my profile it says exactly what country I am from. So I'm striving so that you can understand this story that I'm translating (Yes, this story was originally written in Spanish)
I hope you like this story
See you!