Time skip
A-City Nada public high school.
Today was a special day for many people.
The graduation ceremony for Grade 12th was being held inside the school for a whole day.
Many students dress in black suit came out along with girls dressed in various kimonos dispersing outside the school gate.
A child dress in black suit with a tie around his neck, black hair with gray color iris.
While walking towards the gate, he interacted with many boys and girls, making an odd sight to see a kid interacting like that.
His height around the range of 120 cm, making him standout among the crowd with his appearance and small body.
"Goodbye Ren-Chan" a passersby called out and waived her hands.
Seeing this, Ren smile and waived back politely.
Reaching the gate, a black Mercedes-Benz came in front of him slowly.
Getting inside the car, they rode off.
'Finally I'm done with high school, although it was fun, I have no time to spare if I want to gather funds for my project'
'Hmm I think I can make do for a morning class in A-City Kyoto University, I don't have time to go to another city just for taking a class'
*****
Ren having graduated from high school set his sight on University.
Even though he won't gain much knowledge from the university, he still like interacting with people.
Back at his Aunt house.
The TV channel automatically changed to news "Apologies for the interruption, Recently an 8-foot tall monster is spotted in the outskirts of A-City, everyone is advised to stay indoors"
A short video footage ran, displaying a giant monster who seems to be saying something, in the background many dead bodies lying on the streets.
"Meanwhile, local authorities and special force will find a way to deal with the monster" said a male news reporter.
"Hmmm, The hero association hasn't formed, yet, I wonder how the police will handle it"
'Should I do something about it?' heading to the garage he opened a secret door, inside a gun was lying in the table along with many instruments.
'With this baby, I could probably kill it but after one shot it will overheat, and if the monster survives I'm dead' he thought.
"Ughh…Too many uncertainties, better not meddle with it" Ren said with an annoyed voice.
"If I change the plot too much I won't have any advantage, for now, my company takes priority" said helplessly.
"Let's just focus on gathering funds and science development, maybe I should hire a bodyguard" chuckling to himself while looking at his small palm.
'How about becoming the world's richest man? That doesn't sound bad at all' he thought to himself.
*****
Four years went by.
After his high school graduation, Ren started taking class on Kyoto University while getting involved with his Aunt pharmaceutical research development in his spare time.
At first, many were skeptical, but soon he became an integral part of the company by helping it develop things.
Ren having a big plan didn't introduce all of his research data.
He had planned out that once he reaches 15 years old, he will make a new company with all the workers being robots.
Giving him full control over his own company with no board or council and no opposition.
But that would mean less connection and difficult to get resources.
He needs resources with rare material alike but to achieve that he needs a lot of funds and allies for now, since he planned to later develop a massive army of robots for resources gathering after that he can be completely independent of any political power influence.
'Gosh I want to grow up soon, I can't even start a company cause people don't trust kids and I don't know how child emperor manage to achieve all that with his age' Ren grumbles internally.
The sun hung down brightly across the park, with no visible humans nearby, a healthy child is seen doing a push-up.
With sweat pouring out, his tracksuit was soaked.
"2998"
"2999"
"3000"
"huff"
"Huff"
"That wasn't hard at all" Ren said.
Few years back, when his body adapted to radiation, he tried various kinds of poison in small dosage and had minimal effect.
His body was stronger than normal so he started Saitama training but with 10 times intensity.
'It's time to start training in Martial arts, I'll learn from the best and create my own martial arts, with my brain and the accumulation of all martial artists, I'm sure it will be very strong' Ren thought with an excited expression.
"How was it? Don't you think I'm quite strong?" Ren voice rang out.
Suddenly, a shadow appears behind him with no sound, as if teleporting.
"Strength does not matter, in the world of martial arts, speed determine the victor" said a masked man dressed in black spandex suit with parts of his shoulder and wrist reinforce with steel plate while a katana hung on his back.
"Hmph, what would you do if you meet some with unbreakable defense?" Ren asked.
"There is no unbreakable defense" the masked man replied.
"Okay whatever, I'm not going to argue with you anymore, so can you teach me how to move fast like you?" Ren ask eagerly.
"Hahaha, move fast like me?" the masked man laugh as if it were the funniest joke.
"Would you stop laughing! Yelled.
How about this, I'll pay you handsomely, you only have to show me how you guys train in the ninja village" Ren said annoyed by the mask man.
"Well, I can show you the details on how to train, but I won't help you, but don't go crying if it doesn't work out for you, becoming a ninja require a strong will and complete dedication, something a teeny brat like you won't have" the mask figure said.
"Prepare my payment in advance" to which Ren shrugged.
Ever since his health started getting better, Ren trained hard during his spare time, experimenting on various things while inventing stuff here and there.
He once shot himself with a normal bullet, although scared, he pulled the trigger in a non-vital area.
The bullet managed to pierced through but got stuck on his skin.
It hurts but his body heal it in seconds.
Eventually, he held on thinking about future crisis and eventually manage to adapt to pain after doing it over and over.
With determination, he forged his will with pain and suffering, grappling between fear of self harm and future struggles.
Gradually he overcame his fear of getting hurt by things like guns, poison, acid, cuts, piercing, electricity, lava and strong impact.
Thus, Ren began to start training in ninja technique early in the morning while working on various kinds of research during eve.
Afternoon Ren practice martial arts technique which he bought it from various dojos he could find.
At night, he would study at home, barely getting enough sleep with his busy schedule.
He didn't want to be like metal knight, who only have Robots while being weak physically.
In a world of supernatural powers, he would be an idiot to just live as a smart guy with only technology.
*****
2 years went by in a blink of an eye.
Ren went around to various dojos, he managed to find some with unique specialty while most of them were complete a scam.
He quickly learns everything and only needed to practice a lot to get his body to adapt to muscle memory of those techniques.
His strength rose rapidly, and he estimated that he could fight on par with Bang. (Ren wishful thinking)
His super physique is unique and it's still growing giving him super strength, durability, stamina, reflex, sense, sight, and hearing.
As he grows older, he noticed that he's getting stronger day by day even if he doesn't train.
As for his other project, he finally managed to invent arc reactor.
It was a hassle since all he had was an idea with no construct, even with a genius brain without the tesseract or arc reactor model to get inspired from.
The chances of figuring it out from scratch was close to nil.
Tony Stark was able to make it inside a cave because he already knew all about the Arc reactor, and he only made a smaller version of it.
It was Howard stark who designed it by studying the tesseract, Ren was able to make it from scratch.
But oh well, Nakamura is built different.
With the Arc reactor, he managed to make many worker robots while building a secret base outside A-City.
Along with sending many satellites to orbit the earth and monitor every area.
He even sent a few space exploration robots to transport different kind of minerals which he found in a nearby asteroid, although it will take a year just to reach the location.
In that asteroid, he found a billion tonnes of metal and gold with many other minerals, and that's just an estimate.
As for how he will retrieve it? He made a teleportation device, he just needs a team of robots to input the location and make a gateway which will connect with him.
Though he can open the portal randomly without any anchor, but he doesn't want to take risk in a dangerous world like OPM.
What if he shoots a wormhole and on the other side the one punch man world god suddenly shows up saying "Hi".
He shudders thinking about it.