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One Piece: Ultra Instinct

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Synopsis
Waking up in the prehistoric jungle of Little Garden should have been a death sentence, but for the man now known as Haon, it was a brutal new beginning. The moment he opened his eyes to the sight of towering ferns and hunting dinosaurs, a System flickered to life just long enough to rebuild him from the ground up. It gifted him the "Perfect Body", the absolute peak of human physical potential, and imprinted his mind with the theoretical mastery of every elite fighter from the world of Lookism. From the "Invisible Attacks" of James Lee and the ruthless efficiency of UI Daniel to the crushing power of Tom Lee and the genius of Gun Park, he was given the blueprints for every legendary martial artist. Most importantly, he was granted the ultimate "Copy" ability, allowing him to mimic and master any movement he sees instantly. Then, as quickly as it arrived, the System vanished, leaving him with all the potential in the world but none of the actual experience to use it. Knowing he couldn't master these skills alone in a world of monsters, Haon did the unthinkable: he approached the warring giants, Dorry and Brogy. Impressed by the tiny human's fearless spirit, the legendary captains of the Giant Pirates agreed to put him through hell. For two years, Haon turned the island into his private crucible. He spent every day dodging mountain-sized axes and sparring with giants, using his Copy talent to absorb their staggering physical intent and force his modern martial arts to adapt to the supernatural scale of the Grand Line. He bled, broke, and rebuilt himself, learning how to combine the refined techniques of a street fighter with the raw, world-shaking power of a giant. By the time he was done, his strikes didn't just hit targets, they tore through prehistoric scales and shattered stone. Everything changes when the Going Merry finally pulls up to the shore. Haon has been waiting in the trees for this exact moment, ready to step out of the jungle and join Luffy’s crew. He isn’t interested in Devil Fruits or relying on a System that's long gone. He’s going to climb to the very top of the world using nothing but his own two hands, proving that a man with the training of giants and the power to copy any legend can become the strongest in history.
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Chapter 1 - Chapter 1: The Last Message

The first thing I felt wasn't power. It was the sensation of drowning in dry air.

My eyes snapped open, but all I saw was a blinding, glitchy white light that burned. I tried to gasp, but my throat felt tight, like I'd just finished a heavy set of squats and forgotten how to breathe. This wasn't the gym. This wasn't my room. The last thing I remembered was the screech of tires and the sudden, violent impact of cold metal.

Slowly, the white light faded. I was lying on moss so thick it felt like a mattress. Towering ferns arched over me, blotting out a sun that felt way too hot. In front of my face, a blue screen flickered like a dying lightbulb.

[System Initialization: 100%]

[User Identified: Haon]

[Status: System Energy Depleted]

"What is this? A hallucination?" My voice was different. It was deeper, vibrating in my chest in a way I wasn't used to.

I looked at my hands. I'd spent years in the gym working for every bit of muscle I had, but these hands were different. They were thick, calloused, and looked like they were carved out of stone. I had the mass, but I felt heavy and uncoordinated.

[User Haon, listen,] the text scrolled, glitching in and out. [The bridge between worlds is gone. I have used the last of my energy to rebuild you.]

[Gift 1: The Perfect Body. You have been granted the absolute peak of human physical potential. However, your current Software is incompatible with the Hardware. You must synchronize.]

[Gift 2: The Copy Talent. You possess the theoretical mastery of the legendary fighters from Lookism World & You can mimic and adapt any physical technique you witness.]

"Lookism?" I tried to stand up, but my legs were like coiled springs. I pushed off the ground with the force I usually used for a heavy squat, but without the barbell to hold me down, I launched myself three feet into the air. I panicked mid-air, flailed, and landed face-first in the mud.

"Dammit..." I spit out a leaf. I was clumsy. It was like driving a supercar when I only had a license for a scooter. I had the muscles, but I didn't know how to balance them yet.

"Wait! Don't go!" I shouted at the screen. "I don't even have a map! I'm in a jungle! How do I eat? What about water? I can't just bench press my way out of a prehistoric island!"

[Location: Little Garden. World: One Piece.]

"One Piece?!" My heart dropped. I knew this place. It was a death trap. "Are you kidding me? There are dinosaurs here!"

[The Perfect Body will help you digest almost anything, Haon. But you are no longer in a gym. Lookism was a playground. This is the sea of monsters. If you want to live... don't stop moving.]

The screen shattered. The blue sparks vanished into the humid air, leaving me in a silence that was quickly broken by a heavy, wet thud nearby.

Thump. Thump. Thump.

I turned. Emerging from the brush was an Allosaurus. It was covered in scars, its skin a sickly, muddy green. The smell of rotting meat hit me like a physical wall.

"Okay," I whispered, my voice trembling. "Perfect Body. Copy talent. Don't stop moving."

The dinosaur lunged. It was fast, way faster than anything I'd ever seen on a screen. My brain lit up. Images of Tom Lee and Gun Park flashed in my head. My body recognized the lunge as a telegraphed attack, but my clumsy legs didn't move right. I tried to pivot, but I tripped over a root, stumbling forward instead of to the side.

The dinosaur's jaws snapped shut inches from my hip. The force of the snap sent a gust of wind that nearly knocked me over.

"Move!" I screamed at myself.

The beast swung its tail. I tried to dodge, but I was too slow. I raised my arms to block, a move I'd seen a hundred times. The tail slammed into me like a speeding truck. I went flying, smashing through a thicket and hitting a tree with a bone-jarring thud.

I waited for the pain, but I just felt sore. The Perfect Body had absorbed the impact. I scrambled up, coughing, the dinosaur coming back for seconds. It let out a low, vibrating hiss and lunged again, swinging its massive head like a battering ram.

I tried to use a James Lee evasion, aiming to spin off to the side, but I pushed off the ground too hard. I launched myself sideways and tumbled into a cluster of thick, thorny vines.

"Crap!" I grunted, the thorns tearing at my skin.

The dinosaur charged again. I scrambled up, my heart hammering. As the beast's head came down, I snapped out a left jab, then a right.

Thwack. Thwack.

The punches landed, but they were shallow. I was too stiff. The Allosaurus let out a roar and swiped with its front claws. I ducked, feeling the wind of the razor-sharp talons passing just inches above my hair. I retreated, my back hitting a massive tree trunk. I was cornered.

The beast lowered its center of gravity, preparing for a final pounce.

Okay, Haon. Stop fighting like a guy in a gym. Fight like a monster.

I reached into the theoretical mastery for something heavier: Tom Lee's Wilderness Style. I didn't have his size, but I had the mechanics. As the dinosaur leaped, its jaws wide enough to swallow my torso, I didn't move back. I dropped low, my knees creaking under the sudden tension of my new muscles. I waited until the very last millisecond.

"Now!"

I exploded upward, driving a Wilderness Uppercut right into the soft tissue under the dinosaur's jaw. I felt the impact vibrate through my entire skeleton. The Perfect Body held firm, but the sheer force sent a shock of pain up my shoulder.

CRUNCH.

The dinosaur's head was snapped upward with such violence that its feet actually left the ground for a split second. It crashed backward, its massive tail thrashing and snapping a smaller tree like a toothpick. It lay there, chest heaving, stunned into silence.

I stood there, my knuckles raw and dripping blood. I had won, but I was shaking. I looked at the beast, then at my hands. I actually did it.

"SHYASHYASHYA! Did you see that, Brogy? The little ant tripped, but he still stung the lizard!"

The laughter was like thunder. I looked up, and my victory felt very, very small. Two giants, taller than skyscrapers, were standing at the edge of the clearing, watching me like I was a particularly entertaining beetle.