Noel opened his eyes and saw he was in a classroom then i hear someone say,"I'm so excited to go to other worlds. Hey what world are you going to is it the hunter world or the ninja world their world are dangerous but have great power system for training newbies if you set the time period where the world is peaceful you can train there until you die of old age."
Huh? other worlds? train? what is this guy saying. Then suddenly a jolt of pain rushes into his head and images flashes in his mind, is this memories seems i transmigrated into another world similar to earth but here the the earth changes to multiple times it's original size the scientist currently doesn't know the size because they haven't found the limit it can be limitless, the scientist theories the earth became connected to otherworld via portal on all sides then the other world continued to connect to other world. New race of species appeard but fortunately there's currently no sentient race near our world because the government predict with our current strength we can't match any other world, it's because even the animals near our world, they are already on a struggle.
Good thing the multiversal bereau where you can train different power system on different universe but unlike other novels in my past life the world here doesn't give rewards for completing missions it just transmigrate you to the world of your choosing but here you can choose the timeline and background of the one your being transmigrated to unfortunately you can't transmigrate to anyone except the one you created.
The earth here doesn't have the fictional worlds created in my world that my past life have, fortunately for me i'm a fan of fictional works i have watch,played and read countless fiction but i have to stay vigilant and continue to consume fictional works because maybe the multiversal bereau will change and it will have fictions of all the worlds in this universe but there's a problem i can't pick some worlds because you need to be strong enough to survive the threats of that world for example the movie Lucy you can't survive if you meet her but here's comes the problem if you change the plot the will of the world will stop you or just adjust it to its original course so you can't just grab the drug to become a god.
The person your reborn to fuses with your body so you will have everything the the body have. You can still be transmigrate to worlds that have a possibility of survival example you create a person with a background like an Uchiha or heck even Otsutsuki but the people doesn't know the story so they can't do that but if someone reach 4th great ninja war they can inform everyone or keep it a secret.
As Noel was loss in his thoughts someone ask,"how about you Noel which world are you going to."
Noel looked at the person who ask, i remember his name is Kenji his a japanese mix."I haven't decided yet how about you."
"I want to go to Demon Slayer world or the bending world."
"That's a good a start for your foundation are you going to both worlds?."
"Yes, i'm going to practice flame breathing and fire bending."
The door opened and the teacher walk in,"okay class are you excited for your new adventure but remember time in different worlds is different it can never be the same as ours but we haven't found out yet if it can be because no one have encountered it."
"Now, the way you entered the multiverse bereau is you say Entergration",then the teacher suddenly disappear and reappeard.
"You try but don't go to other worlds yet you can do it later after school."
Some decided to immedietly go there but i wait until a few people come back, a few minutes later 7 people have come back already then it's decided,"Entergration."
I was transported to a lobby but this lobby is different it have a mix of every genre of fiction it's so otherworldly, i look around and there's many people few of my classmates are here too then i walk to the manager,"can i ask a question sir", the manager look like a human i thought it's going to be a different race.
"Yes what is your question."
"I want to know if you can set anything as your background."
"Yes you can set anything you want."
"Thank you", then i exited through a door to return back to earth.
I appeared back in the classroom and i'm the last one that returned. A few minutes later the teacher finally dismissed the class.
When i returned home i greeted my grandma then entered my room my grandma is the only relative i have left so this body loves her very much and takes care of her.
After checking my grandma's condition and talking to her for a few minutes i entered my room search a bit on the internet a few minutes later i found out the strongest human is a continental level with powers of, breathing, bending, quirk, nen, zoan devil fruit, Uchiha, falna, skill and magicules and ki, the same goes for the other strong human, after i finished searching i enter the multiversal bereau.
"Entergration", Now that i've been here a second time the lobby never seizes to amaze me, i walk up to the desk,"manager open the list of worlds."
I scroll down studying each world and i ask,"if you exited the world what happened to that world and can you bring back things from the world."
"Nothing time will stop and you can return to that body whenever you want and yes you can bring back anything."
"Okay transmigrate me in the hunter world as an dark continent human progenitor the same age as Ging Freecss at the end of 267th hunter exam as a hunter", in record of ragnarok Adam almost beat Zeus if wasn't for plot Adam could've won the match now imagine if a dark continent progenitor fought Zues.
I suddenly feel my body travel at lightspeed and i arrive in the body of the hunter world and the first thing i saw is netero explaining what a hunter should do after that they gave us the hunter license.
My name is still Noel and from my memories this boy have awaken Nen recently but he doesn't have the progenitorn bloodline and his just peak human physics and intelligence now i've transmigrated i've awaken my dark continent progenitor bloodline.
And my body is overpowered i can think at infinite speed as if time stop and my basic sense can reach the whole world not just the known world but i'm surprise that there's not just one super continent but six and one of them is much larger than the rest.
I stop sensing and returned my thought process back to normal."Ging where are you going next because i'm thinking we can meet again, here is my number."
"I'm just going to explore the world and thanks i'll call you if i need something and here's my number call me you need anything", then we parted ways.
For 6 months i trained Nen until i have full mastery of it then i log out because my grandma is still alone in the house and because i can just returned back whenever i want. When i appeared back at the lobby i saw few of my classmates.
"Yo Noel just exited too? why didn't you say your going to other world you could've join us we just came out of demon slayer world we trained for 2 years and fought a few demons to hone our battle experience, which world did you go to", i hear Kenji say to me.
"I didn't want to bother my friends because i don't know the time difference in each world and i just want to learn Nen in the hunter world and go back so i just stayed for 6 months i barely opened it a few days before i log out."
"I see good thing we studied the demon slayer first 2 years in that world equals to 2 hours in earth time the same for the bending world so it means 2 hours have just passed in earth, so were going to the bending world next want to come join us."
"I see thanks for telling me but i'm going to demon slayer world first so i can learn breathing techniques just like you guys."
"Okay join us next time", then my classmate called Kenji,"guess its time good luck on your next world choose what you want to train wisely see you later at school."
"Good luck and see you too." Then they disappeared
So 2 hours only pass by it means i got time to go to a few more diffirent worlds before dinner with my grandma and help her to get younger because she is already 87 years old i'm worried she's going to pass away any day now.
I talk to the manager again and pick the world demon slayer," i want to be transmigrated as a progenitor of human as Yoriichi Tsugikuni younger triplet at the age of 7 years old.
At the Tsugikuni clan manor a 7 year old child is demolishing a skilled swordsman in a 1v1 duel the child have a spiky hair with red hues and a mark on his face like fire.
Memories of the life of this body flashes in my mind, hmmm so my name here is not Noel but Noeru it's a japanese name for Noel, i'm also born with a mark,transparent world selfless state and flow state it's like ultra instinct no it is ultra instinct but not like goku but like the angels ultra instinct and i look similar to my brothers but i have a sun mark on my palms and sun like eyes.
And since now i posess the body of Noeru the bloodline of human and dark continent human progenitor fuses with this body or maybe its locked and it can only be unlock if you fuses with the body.
I walk up to yoriichi," amazing nii-san you beat our instructor easily how about we fight next."
"Okay."
"Here i come", i charge at him with my wooden sword, at first Yoriichi was holding back maybe because i'm his brother but i'm not going let that happen i intensified my attack and speed up i use more force in my swings but yoriichi is still on a defensive just blocking and dodging the attack.
I increase the pressure even more when one of my swing almost landed on his shoulder but he dodges at the last second.
"What's wrong onii-san why aren't you attacking do you think i'm weak because i'm younger than you fight seriously or i'm going to beat you."
"Fine", Yoriichi now began attacking and increases his speed and power and i match his speed and power but i'm different i have the flow state meaning i can dodge his every attacks the fight intensified increasing every clash Yoriichi slashes at my torso and i dodge it and i immedietly counter attack the attack landed at the ribs but i held back my power damaging it so he can only have trouble breathing.
7 minutes in our fight Yoriichi is breathing heavely,"what's wrong nii-san having trouble breathing why don't you manage your breathing."
Yoriichi hearing his brother focus on his breathing a few seconds later he catch up his breath by breathing specific patterns.
He's starting to develop the breathing styles, more i need to push him harder, on the side Michikatsu and his parents and some people on the clan watch the battle in awe of what they are seeing one of them even said,"are they even children."
Michikatsu seeing his 2 younger brothers engage in a fight a sense of inferiority came inside him and he thought, how are they so good at swordsmanship when i have been practicing the sword far longer than they did, this is even the first time they hold a sword and there already stronger than a veteran swordman an extreme jelousy begun to crept in his mind.
30 minutes into the fight yoriichi finally develops Sun breathing because of transparent world but it's only the first form.
Good his beginning to form techniques i should make my breathing techniques too Nature breathing first form: earth Dance by using earth Dance the user uses all earth breathing techniques in succession the combo overwhelmed Yoriichi making him put more effort on making breathing techniques the battle continued to intensified until Yoriichi develops his 13 forms but surprisingly his still developing forms and using them in succession, his breaking his limits no his realizing his full potential i got to push him to his limits i've continued developing earth breathing forms until it reach 25 form then i develop water breathing Nature breathing second form: Water Dance, i develop it until it reach the same as earth breathing i'm going to limit it to 25 forms until yoriichi reach 50 or 100.
The speed at which the battle is taking the normal eyes can not see them anymore and the battle have been taken outside to avoid casualties.
Suddenly Yoriichi began moving efficiently with no wasted movements and the attacks of Noeru doesn't touch him anymore.
His entered the flow state Yoriichi you monster you can still develop at this stage and your still 7 years old, this is getting more interesting now i develop all of my form Nature breathing third form: Wind Dance
Nature breathing fourth form: Fire Dance
Nature breathing fifth form: Thunder Dance
Nature breathing sixth form: Ice Dance
Nature breathing seventh form:Force Dance
Nature breathing eighth form: Time Dance
Nature brearhing ninth form: Plant Dance
Nature breathing tenth form: Shadow Dance
Nature breathing eleventh form: Light Dance
Nature Breathing twelveth form:Moon Dance, Nature Breathing thirteenth form: Sun Dance, Nature Breathing fourteenth form: Void Dance, Nature breathing final form: Nature Dance, the final form utilize all previous form in succession.
But i didn't use them yet it's not time to finish the fight i'm going to push the limits of my brother first.
After 7 hours fighting Yoriichi develops 100 forms of Sun breathing of course i copied it and i also developed 100 forms of all of the Nature Elements, Yoriichi suddenly stops.
"What's wrong nii-san why did you stop."
"Lets end our match you win."
"Yay i beat onii-san."
"Your really strong Noeru but remember with great power comes great responsibility you shouldn't use your power for evil and i'm proud of you Noeru."
"Okay onii-san i'll use my power with responsively and i won't use it for evil, and thank you onii-san it means a lot to me to know that your proud."
Our father interups our moment and say," i'm also proud of you both Noeru your going to be the next head of the family."
"No thank you let nii-san be the head."
"Uhh okay Yoriichi your the next head of the family."
"No thank you nii-san is the oldest he should be the head."
The father of both Yoriichi and Noeru is speechless at their at their quick rejection but he doesn't have the power to do anything because he's weaker than them.
A few weeks later Akeno Tsugikuni passed away and Yoriichi left followed by Noeru, during that time Noeru teaches Yoriichi Nen and Develops Rokushiki and Semei Kikan version of demon slayer because of transparent world the anatomy of human being can practice this only if your using breathing technique of the demon slayer world to strengthen their physics me and Yoriichi further strengthen the physical enhancement of the breathing techniques.
After they left the Tsugikuni clan, we met the girl that will become Yoriichi's wife. I'm not going to let your wife and son die nii-san i promise. When we reach Uta's house i bid them good bye
"Where are you going next and come visit us sometimes."
"I will just travel around till i find something interesting, don't worry i'll come back after a few months."
After i left i teleported to the spot where the blue spider lily, the teleportation is not my hatsu ability it's just basic emission ability after that i conjured a house with all the things i need for the experiment i'm going to do.
2 months later i perfected the serum or i even go beyond it, the serum effects when injected will grant you peak youth, immortality, super regeneration, speed, power, durability, intelligence, etc and blood art your can also share your own blood to transform them into your race you can also create any blood art you imagine but it doesn't change your race it just evolve it at super speed in 1 day after that it will return to normal but if you consume dna of other species for example you eat a horned dung beetle you will get the dna that will help you make much higher quality bloodline and after that it accelerate the chosen dna at super speed in one day.
After a few more testing i injected the serum and waited one day, the effects are immedietly displayed because i rapidly becoming stronger at high speed then i created a pocket dimension and train to familiarise my strength i perform all breathing forms and added more to sub breathing form after 3 days of training i develop 500 forms in each breathing form that i will never use but it still fun to develop forms remember netero have millions of attack combination maybe even one day i'll get the chance to use them on a powerful person i also develop the Royushiki and Semei Kikan to make them easier to practice i also develop a technique similar to kaio ken but opposite of it instead of multiplying the power you control and maximize your aura to release an even greater force i call this aura manipulation and aura maximization to multiply your power base on your mastery and i also make a technique similar to sage mode in naruto base on breathing techniques to absorb nature energy after that i send an unbreakable book of all of my techniques and Nen training to the demon slayer corps that will be bound to the ubayashiki until they defeat Muzan after that it will teleport to a worthy user every 5 years.
Before i log out i set a protection on Uta and Yoriichi family that they will in peace and have the life that Yoriichi want.