Notes:
Hi guys i am just a new writer who thought it would be fun to right a what if rengoku came to the jujutsu kaisen world after the fight with akaza i hope you enjoy. (One thing inthe demon slayer manga it says that the fire and water and other styles are not real fire of water the breathing technique just mimics that technique.)
Work Text:
Mother did i do a good gob, was i successful? A man with fire like hair asked a woman
The woman smiled"i am so proud of you Rengoku."
With that the man named Rengoku took his last breathe.
"Now i am able to rest." Rengoku thought while everything became dark and every sound he once heard had vaded.
"No it is not your time" said a voice.
With those words said Rengoku felt a strange feeling around his body. And saw a bright light removing every bit of darkness.
Rengoku woke up lying somewhere in an abandoned building's corridor with his eyes half closed. While at the same time the sun was setting and could be seen shining on him through the broken windows. His breaths was heard clearly. Then, his eyes widen as he remembers his injuries and...
"Nothing?", He thought while feeling his stomach. The injury given by uppermoon 3 was no where to be seen on him. It seemed that all the injurys he took during the battle had gone away.
Rengoku walked though the abondent building and took up a piece of a broken mirror he had found. He took a moment look at himself and seemed shocked with his appearance.
His face like the one of a teenager he looks like a 16 year old.
He was a bit shorter and his face seemend a bit younger. However he he still has his muscles from training and his swords was still on him with the demon slayer uniform.
Suddenly, he felt a shiver down his spine. Is it a demon he's sensing? No it felt quite different and the bloodlust seems quite strong. He takes his stance that is perpared for any sneek attack and looks around the corridor.
There it is, at the end of the corridor, a weird/disgusting creature on four legs. He lowers his body, readying himself to decapitate the thing.
"Flame breathing, first form: Unknowing Fire"
He speeds towards the creature, unsheathing his sword and decapitating it.
"What was that real fire that I just saw..?" Rengoku thought. He is a user of flame breathing but... it was just a swordsmanship style that mimics the moves of flames its got nothing to do with real flame.
"OI NANAMI! LOOK AT THAT!"
Rengoku heard the voice of a young man. He turns around to see two people, one seemed younger with pink hair and the other seemed to look older with blonde hair.
"Hey, who are you? Are you a sorcerer? I've never seen you before," the older one of the two asks he reminded Rengoku a bit of Giyuu cool, calm and colected.
"My name is Rengoku Kyojuro! Did the demon hurt you?" He asked, in his usual loud voice.
"Demon? You mean that cursed spirit? No... we just got here... to exorcise it" The older one said, keeping his distance while the pink haired boy was already close to Rengoku looking at him from different angles with admiration and curiosity.
"Good! Could you two tell me where i am?" Rengoku asked still with his usaul loud voice.
"We are now currently in Tokyo" the younger one says.
"I see" Rengoku says with a smile.
"Do you know where's the Ubuyashiki Estate is?"
"Ubuyashiki? No-uh, no idea who that is"
Rengoku then realized the two male´s uniforms looked rather odd. Then, he looks outside through the window. He was not on the ground floor and there was a view unlike what he has ever seen.
"Where is this? Is it still Taisho-Era?" Rengoku's voice becomes low, and the smile on his face fading away, there came a concerned look on his face.
"Taisho-era? that was-"
"The Taisho era has long passed about a hundred years ago" Nanami answered Rengoku, interrupting the other boy.
"That doesn't matter, you need to come with us. Itadori, call Ijichi, and tell him the cursed spirit was exorcised by an unknown sorcerer" Nanami added.
"If you refuse to come, then I'd have to make you" namani said
Rengoku sighs, closing his eyes, trying to calm himself down in the midst of his confusion. He smiles, turns to Nanami and says.
"Okay i shall follow you, I don't know where I am now!" His voice returned to normal.
...
The three are making their way to the exit. The silence was broken by Itadori who asked.
"Soooo... Why did you bring up Taisho-era, Rengoku?"
"As far as I remember, I was in the Taisho-era, but I doubt that that is still the case. I was always fascinated by the Asakusa City, which was very advanced at the time. The buildings there were tall, however not even as tall as this building we're in right now" Rengoku says
"Wait are you saying you travelled to the future?!" Itadori exclaimed with suprise.
"Enough Itadori, we don't know who he-" Nanami is trying to say something, but was interrupted by Rengoku.
"No I wouldn't say that! I think I am in a different world since you don't know the famous Ubuyashiki family, or maybe-"
He stopped walking. He thought,
"If they don't know about the Ubuyashiki family, have we failed then? No that can't be true but..."
"Maybe what?" Itadori words snapped Rengoku back to his right mind.
"Ohh nothing but, that thing just now, I heard you call it cursed spirits?" Rengoku questions as they continue to out of the building.
"Yea, and you exorcised it" Nanami said
"Even though you aren't a sorcerer you defeated it without much difficulty?" Itadori added
"It seems demons aren't a thing here in this time of age. Even if the terms demons and demon slayers are swapped with cursed spirits and sorcerers, I don't see them yield any nichirin blade." Rengoku thought.
"Wait what if i was send to another world that would explain all this and why they dont use a nichirin blade."
"Are you one of those sorcerers? Are they perhaps a big organization?" Rengoku asks again.
"Yes, a jujutsu sorcerers job is to exorcise cursed spirits all over Japan that can cause harm to human. I can exorcise cursed spirits-" Itadori answered partially, as he was disturbed by Nanami.
"Oi, we're outside, and Ijichi is already here"
They enters the car.
"If you don't know about how things work, this thing is called a car! C. A. R. car, like a carriage but without the horse!" Itadori explained.
"AMAZING!" Rengoku said, or rather, shouted with stars in his eyes.
"I called Gojo and let him know about the situation, I think it is best if he is to meet this rather... Interesting, man himself." Ijichi said while looking at Rengoku.
"Thank you Ijichi" Nanami replied.
"Rengoku... When he exorcised the cursed spirit, his body was flooded with cursed energy... And that cursed tool too. Yet he looks clueless about even curse energy. I'm glad I didn't have to fight him. Now I just hope he has no malicious intentions" Nanami thought.
The ride went smoothly, with Itadori explaining stuffs about the this world to Rengoku in the backseats while on the occasional "AMAZING!", "AWESOME!", and "WONDERFUL!" Came from Rengoku mouth.
"Oi Nanami, won't dont we feed Mr. Rengoku something? I bet people get hungry when they... When they travels through worlds right Rengoku?" Itadori said looking back at Rengoku.
"You can call me kyojuro-san and yes i am quite hungry!" Rengoku said.
Nanami turns his head a bit, just enough to see Ijichi eyes pinned on him. Nanami just gave a little nod.
...
"DELICIOUS!" Rengoku said- no, shouted.
They all stopped at a convenient store and Ijichi bought some food for Rengoku to eat. In the car as they need to see Gojo-sensei ASAP.
"Nanami, right? Itadori told me about Jujutsu High and other things jujutsu related, your world and mine arent so different," Rengoku called Fushiguro's name, giving him a little shock. What's more shocking is that Itadori told him about Jujutsu High.
"Sigh, are not suppose to tell him so much about that kind of things?" Nanami told Itadori with a disappointing look.
"B-but, since you brought him into the car without any restraints, I thought he had our trust" Itadori felt a little guilty.
"I know it would be hard to believe me, but i am your ally! Humanity's ally! When I meet your leader, I'll make sure I prove my sincerity! My world or not, my life goal has always been to help and save as many people as i possibly could!" Rengoku said.
No one responded.
"That better be the case" Nanami said in his mind. Suddenly the engine stops.
"Nanami, we're here" Ijichi said,
"Mr. Gojo should already here to." he added
All there of them step out of the car.
"Well, what do we have here!" said the tall man with white hair and the same uniform as Nanami and Itadori.
Author notes
So what did you guys think i have more fanfictions in mind but if you like this one the i could go on with this one.
Note: i do not own jujutsu kaisen or kimetsu no yaiba this i just like to write a fanfiction