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Naruto: The Rubber Ninja

reiyaaura
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Synopsis
Team battles. High-speed combat. An original female lead. Rubber powers fused with chakra. Haki. And the ultimate convergence of five elemental forces. When Hikari Kinoshita is reborn into the world of ninja, fate takes an unexpected turn. She consumes a mysterious Rubber Fruit, gaining a body that bends, stretches, and transforms beyond human limits. From that moment on, her fighting style becomes wild, explosive, and utterly unpredictable… often punctuated by her signature battle cry: “Ora, ora, ora!” But Hikari is not content with simply copying power from another world. She evolves it. By merging rubber physiology with ninjutsu, she creates a completely new combat system, blending elasticity with chakra control, and later awakening a force similar to Haki, pushing her body and willpower to their absolute limits. As her strength grows, so does the scale of her battles. In her most terrifying form, she enters Fourth Gear: Boundman, turning her body into a living weapon of compressed power and speed. Around her, five elemental dragons coil and roar: The Explosion Dragon, embodying destructive force The Flowing Dragon, fluid and ever-changing The Paralysis Dragon, striking with lightning-fast precision The Heavy Dragon, crushing everything with overwhelming weight The Cutting Dragon, slicing through all defenses Together, they form a devastating ultimate technique: “Rubber Style: Five Elements – Supreme Ape King’s Spear!” From early growth, through periods of stagnation, to explosive breakthroughs, Hikari’s journey is anything but smooth. Even tailed beasts hesitate before her overwhelming Third Gear power. Against the strongest of enemies, she pushes further, proving that in Fourth Gear, even legends can be challenged. And when she reaches her peak… She dares to chase down gods themselves. At unimaginable speed. Even Kaguya cannot escape her.
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Chapter 1 - Chapter 1: My Brother Is Seriously the Worst

Konoha, Year 30

How should I put it?

The sun rises, roosters crow, and it's another perfect day to hustle for a better life.

As the greatest ninja village in the world, Konoha boasts an impressively high happiness index. The villagers walk around with smiles on their faces, content and at ease.

At this moment, the wide streets grow a little livelier.

A six-year-old boy weaves through the crowd.

"Grandpa Yuta, let me help you with that."

"Aunt Suzuko, you dropped your fruit."

He pushes carts, picks up fallen produce, and helps with whatever small tasks he can manage. Afterward, he waves goodbye with a bright smile.

"I'll come again tomorrow."

His name is Flynn Kinoshita.

Full of energy, with jet-black hair that gleams under the sunlight, clear and innocent eyes, and a radiant smile.

But beneath that youthful exterior lies a mature soul.

Flynn Kinoshita is a transmigrator.

As for how he transmigrated, or whether there's any secret technique behind it… probably just staying up too late, drinking too much, smoking too much, pushing your body past its limits until everything goes black. And then, well, you're here.

Being reborn into the world of Naruto filled him with mixed emotions.

The only piece of good news was that he was born a proper Konoha native.

His parents were both elite jonin. When he was three, they died during a mission.

Now, all he has left is his older brother, twelve years his senior, a Special Jonin who currently teaches at the Ninja Academy.

After living in Konoha for six years, Flynn can say this with absolute certainty:

If you want to slack off here and live an easy life, it's impossible.

What would you do if a manga world suddenly became reality?

Of course, you'd aim high. Defeat powerful enemies, rise to the top, marry well, and live a legendary life.

But Flynn never expected that before he could even worry about any of that, trouble would come knocking first.

A certain high-ranking official had already taken an interest in him.

"Kid, how about joining us to help protect Konoha?"

And just like that, Flynn's nightmare began.

Every one to three months, that man would visit under the guise of offering condolences, approaching the children of fallen ninja and asking if they wanted to join his organization and follow in their parents' footsteps.

The reason was simple.

They had potential.

So if one day you made plans to play with your friends, only to find a few of them missing, don't be surprised.

Don't panic.

They've simply gone off to serve the village in secret.

The children left behind would look on with envy, quietly blaming themselves for being ordinary, for not being chosen.

Living with that kind of threat hanging over your head is unbearable.

No, terrifying.

Flynn never let his guard down for a second. He feared that one day he'd wake up in a damp underground chamber, greeted by a masked figure saying:

"Welcome. You're one of us now."

Was that scary?

Absolutely.

Did being a transmigrator make any difference?

Not at all.

So from the age of four, whenever his brother was away from the village, Flynn would go out of his way to help the neighbors, making himself visible, making himself known.

His goal was simple.

If one day he disappeared, at least someone would notice.

As for whether that would actually help, that was up to fate.

The truth was, Flynn Kinoshita was insignificant. Aside from his brother and his closest friend, Minato Namikaze, no one would really care whether he lived or died.

So his dream, like many others in Konoha, was to become Hokage.

But his reason was different.

Others wanted to protect the village and their comrades.

Flynn just thought:

If I become Hokage, then if I go missing, people will definitely come looking for me, right?

Like that legendary Kazekage whose death once triggered a massive conflict across the ninja world.

Lost in these thoughts, Flynn arrived at the Ninja Academy.

Today was the first day of school.

And the first step toward becoming Hokage.

Inside the academy, children buzzed with energy, chatting nonstop like a crowded marketplace.

Flynn sat quietly at his seat, looking at the man on the podium with surprise.

That was his brother.

So this counts as having connections, right?

At that moment, he noticed the veins bulging on his brother's forehead. It was obvious he was struggling to endure the noise.

"Quiet!"

The shout was thunderous.

Instant silence.

These children were the treasures of their families. Being yelled at like that was a shock.

Some of the more sensitive ones had already teared up, ready to burst into tears.

Kenta Kinoshita, new to teaching, had never dealt with something like this before. Sweat formed on his pale face.

This is bad.

They're crying without even being hit. Why are they so fragile?

What am I supposed to do if they all start crying?

He had just returned from the frontlines due to an injury and was assigned by the Third Hokage to teach at the academy. The shadows of war still lingered in his mind.

What should he do?

Was his first class really going to end in failure?

Should he change his approach?

No.

Not yet. First, he needed to establish authority.

But how?

Just then, his eyes landed on Flynn sitting by the window in the back, looking completely relaxed.

A ruthless idea flashed through his mind.

Sorry, little brother.

"Flynn Kinoshita!"

"Huh?"

Flynn blinked, confused. A bad feeling crept up his spine.

"Why are you talking during class? Why can't you follow the rules? Get out!"

Classic teacher move. Two accusations, one command.

'I knew it. That's so like you, big brother.'

With a resentful expression, Flynn walked out of the classroom, already used to this kind of treatment.

Seeing the confusion and hurt on his brother's face felt like a knife stabbing into Kenta's heart.

Forgive me. Just this once.

But the sacrifice worked.

The class was instantly subdued.

After asserting control, Kenta's sharp gaze softened, and a gentle smile appeared.

"Everyone, please don't talk during class. Pay attention and study hard so you can carry on the Will of Fire."

Even at six years old, the children could tell.

This teacher wasn't just strict.

He was a performer.

At the back, a blond boy, Minato Namikaze, watched with a helpless expression, clearly used to it.

The bell rang.

Class was over.

As Flynn was about to head back inside, Minato grabbed his hand and pulled him toward a small grove behind the school.

Before Flynn could complain about his brother, Minato took out two rice balls wrapped in seaweed and handed one over.

"This is for you. Your brother was too harsh. You weren't even talking. Try it. I made them myself."

"Thanks."

Flynn took a bite without hesitation.

They had grown up together. Their parents had been teammates, and both had died, leaving them as orphans under Kenta's care.

Flynn's eyes lit up.

This was surprisingly good.

Better than anything he could make.

He gave a thumbs-up, full of praise.

"This is amazing. Your cooking is incredible. Can I have this every day?"

Minato hesitated.

Their living conditions weren't great. The village managed their stipends, and they only received a small allowance each month.

But seeing Flynn's hopeful expression, he couldn't refuse.

"It's settled then. I'll give you my allowance. Honestly, I'm already addicted to this."

Flynn clapped his hands, not giving Minato a chance to back out.

This wasn't exploitation.

Eating together builds bonds.

This was the first time Minato had shared food with him. Opportunities like this were rare.

"Minato, I'm counting on you."

Minato's cheeks turned slightly red as he smiled.

"Alright. I'll handle the cooking from now on."

And just like that, the two boys made a promise in the grove.

Not far away, Kenta watched silently, putting away the three rice balls he had prepared.

So this is what bonding looks like.

I can't fall behind. From now on, I'm joining them. Cooking is all on Minato.

Flynn returned to the classroom and sat upright, listening carefully.

Today was his first lesson on chakra.

"Chakra is formed by combining the physical energy produced by the body's cells with spiritual energy. It is the foundation of all ninja techniques. Through hand seals, chakra can be shaped and used to perform jutsu."

"Don't rush your training. Take it slow. Now, give it a try. I'll be watching."

Chakra.

The origin of everything.

The supernatural power of this world.

Finally, he was in contact with it.

Flynn formed a hand seal and focused inward.

Soon, he felt a mysterious energy flowing through his body, gathering toward his core.

Then suddenly:

[Ding. Energy fluctuation detected. Activating Multiverse Proficiency System.]

[Ding. First world reward: Rubber Fruit (non-toxic version).]

"First world? Then how do I reach the second one?"

[That depends on the readers. Without support, not only will you fail to reach the next world, you might not even survive.]

"…"