I am in One Piece

The fortress of the Chinjao Family loomed before the Nexus Pirates, its massive iron gates guarded by the warriors of the Hippo Navy. Though seasoned fighters, their grips tightened around their weapons as a palpable pressure filled the air—the presence of Silvers D. Jason was unlike anything they had ever encountered.

Jason didn't knock.

With a mere glance, he released a controlled burst of Conqueror's Haki, shaking the fortress to its foundation. Warriors collapsed, their consciousness snuffed out by Jason's overwhelming will. The gates flung open violently, as if bowing to his command.

Inside the main hall, Don Chinjao sat upon his throne, flanked by his grandsons, Sai and Boo. Their eyes narrowed as Jason strode forward, his crew following in his wake.

Jason's voice was calm yet absolute.

"Don Chinjao, I come not as an enemy, but as a conqueror. Join me, and rise to power once more. Refuse, and I will take what I need."

Chinjao's expression darkened. "Boy, do you know who I am? I once split the Ice Continent in half! You think you can command me?"

Jason smirked.

The Nexus Pirates had stormed the Chinjao Family's fortress, drawing the attention of Don Chinjao and his top fighters, Don Sai and Don Boo. Jason, standing at the forefront, smirked as the battle was about to begin.

"Alright, everyone," Jason commanded, stepping back. "This one's yours. Show them what the Nexus Pirates can do!"

With that, he let his crew take center stage.

Law vs. Don Chinjao

Trafalgar D. Law stepped forward, facing the legendary Don Chinjao, once renowned for his monstrous headbutts that could split mountains. The aged but powerful warrior cracked his knuckles, his massive frame radiating intimidation.

"So, you're the Surgeon of Death," Chinjao muttered. "Do you think your little tricks can match my Hasshoken?"

Law smirked, raising his Kikoku. "Let's find out."

With a flick of his fingers, a Room expanded around them. Chinjao lunged forward, his Hasshoken-infused fist vibrating as he threw a devastating punch. Law sidestepped with Shambles, instantly teleporting behind Chinjao and slashing at his back.

Chinjao twisted, covering himself in Armament Haki, blocking the attack just in time. The old warrior countered with a brutal headbutt, his Haki-infused drill forming at the last second. The air cracked as the force of his attack clashed with Law's Takt, which lifted a chunk of the battlefield to intercept. The impact shattered the stone, sending debris flying.

"You'll need more than tricks to beat me!" Chinjao roared, sending a Hasshoken shockwave through the ground, causing the terrain within Law's Room to ripple violently.

Law grinned, already having predicted the attack. "Then I'll just rearrange the battlefield."

With a swift Shambles, he switched places with a chunk of rubble behind Chinjao, dodging the shockwave entirely. The moment he landed, he thrust out his palm.

"Counter Shock!"

A surge of electricity burst from Law's hand, striking Chinjao square in the chest. The old man gritted his teeth, resisting the paralysis, but it gave Law just enough time to close in.

"Gamma Knife!"

A concentrated energy blade plunged into Chinjao's abdomen, disrupting his internal organs. The old warrior gasped, staggering backward, but he wasn't finished yet. Summoning his last reserves of strength, Chinjao launched forward, aiming one final Hasshoken-enhanced headbutt.

Law smirked, activating Scan, predicting the trajectory. As Chinjao's head came crashing down, Law vanished once again with Shambles, reappearing just above him.

"Injection Shot!"

A precise thrust of his sword, imbued with Armament Haki, pierced through Chinjao's shoulder, sending him crashing into the ground with a thunderous impact.

Breathing heavily, Law landed gracefully. "Looks like your era is over," he muttered.

Bepo & Koala vs. Don Sai

Bepo and Koala faced off against Don Sai, the current leader of the Happo Navy. Sai smirked, cracking his knuckles.

"You think the two of you can handle me? Don't underestimate the next generation of the Chinjao Family!"

Bepo growled, his white fur shimmering as he activated his Tsuki Tsuki no Mi abilities. His body became more streamlined, his strength and speed increasing under the moonlight. Koala, meanwhile, shifted into her Bakeneko form, feline features emerging as she tapped into her Devil Fruit's agility.

"Let's test that theory," Koala said, vanishing with a burst of Soru, appearing behind Sai and delivering a clawed strike. Sai barely blocked in time with his Hasshoken-coated leg, the impact creating shockwaves.

Bepo seized the opening, his claws glowing with lunar energy. "Moon Fang Barrage!" He lunged forward, slashing at Sai in rapid succession.

Sai countered with Armament Haki, meeting Bepo's strikes with his own powerful blows. Each collision sent shockwaves rippling through the battlefield. "Not bad," Sai admitted, "but let's see how you handle this!"

He leaped into the air, twisting his body. "Hasshoken: Drilling Heel!"

A spiraling kick, vibrating at an extreme frequency, shot toward Bepo. The mink barely managed to dodge, but the force alone sent him skidding backward. Koala darted in, her hands glowing. "Bakeneko Phantom Claws!" She slashed at Sai with energy-imbued strikes, each one leaving afterimages that made it difficult for him to predict the real attack.

Sai gritted his teeth, forced on the defensive. That was when Bepo reappeared behind him, his Moonlight Energy building up. "Got you," Bepo growled.

"Lunar Howl!"

A concentrated burst of moonlight energy erupted from Bepo's mouth, engulfing Sai in a bright explosion. When the light faded, Sai was left standing, breathing heavily, his clothes torn and burns visible on his body. He chuckled, wiping blood from his lip.

"You two are strong… but this fight is over for me." With that, he collapsed.

Monet, Reiju & Robin vs. Don Boo

Don Boo, the hulking vice-captain of the Chinjao Family, laughed loudly. "Three against one? You must think I'm weak!"

Reiju smirked, electricity crackling around her wings. "We just don't like wasting time."

Monet transformed into her harpy form, her Snow-Snow Fruit ability creating a chilling mist that blanketed the battlefield. "Let's finish this quickly."

Robin crossed her arms, dozens of Hana Hana no Mi limbs forming around Boo, aiming to immobilize him. "Cien Fleur: Bind."

Boo struggled as the limbs wrapped around his body, but his sheer strength allowed him to resist. "You think you can hold me?!" His muscles bulged, Hasshoken vibrations erupting from his body, shattering the extra limbs.

Monet acted next, launching forward with Ice Talon Slash! Her frozen claws raked across Boo's chest, leaving deep marks of frostbite. At the same time, Reiju soared above, gathering a massive charge of electricity.

"Thunderbird Strike!"

She dived down, unleashing a powerful bolt of lightning that struck Boo head-on. The giant man screamed as the shock coursed through his body.

Robin used the opening, summoning massive Hana Hana no Mi hands that erupted from the ground beneath Boo. "Ochenta Fleur: Slam!" The gigantic hands smashed Boo into the ground with a powerful impact.

Struggling to rise, Boo groaned, his body barely able to move. Monet landed beside him, touching his frozen wounds. "Let's end this."

"Permafrost Bloom."

The frost spread rapidly, encasing Boo's limbs in thick ice, sealing his defeat.

Reiju landed next to them, nodding approvingly. "Well, that was fun."

Robin crossed her arms, her usual smirk returning. "A bit easy, but effective."

With all three battles concluded, the Nexus Pirates stood victorious. Jason watched from a distance, satisfied.

"Not bad," he murmured, watching his crew catch their breath.

The fortress of the Chinjao Family had fallen. Now, it was time to move forward with their real objective.

Jason spoke, his golden eyes glowing. "I want the Hasshoken training method. It will be taught to my crew and integrated into my Grand Fleet. Refuse, and I will take it from your corpse."

Chinjao wiped the blood from his mouth, his pride warring with reality.

After a long silence, he exhaled sharply. "Fine. But Hasshoken is not just a technique—it is a way of battle, a mastery of vibrations themselves."

Hasshoken Training Begins

Jason opened the ancient scroll detailing the training method of Hasshoken, a combat style that used vibrations to bypass defenses and rupture enemies from within.

Hasshoken Training Stages:

• Phase One – Resonance Mastery: Practitioners learn to feel vibrations in their own body, amplifying strikes without relying on brute force.

• Phase Two – Controlled Shockwaves: Users generate shockwaves upon impact, sending tremors through weapons, armor, and enemies.

• Phase Three – Internal Destruction: Masters of this phase can rupture internal organs without leaving external wounds.

• Phase Four – Hasshoken Flow: The pinnacle of mastery, allowing users to release continuous vibrations, forming an impenetrable offense and defense.

Jason smirked. This was exactly what his crew needed.

He turned back to Chinjao. "Gather your strongest warriors. This is your initiation into the Nexus Grand Fleet."

The Nexus Grand Fleet's Gift

Chinjao assembled Sai and Boo, his most powerful warriors. Jason reached into his treasure inventory, withdrawing three legendary Devil Fruits—each shimmering with untapped potential.

• Tōrō Tōrō no Mi, Model: Qilin (Mythical Zoan) – A divine beast of fire and lightning, granting immense speed, durability, and elemental mastery. (Sai's Fruit)

• Tōrō Tōrō no Mi, Model: Bison King (Mythical Zoan) – A beast of unmatched endurance and raw power, capable of unstoppable charges. (Chinjao's Fruit)

• Kōtetsu Kōtetsu no Mi (Paramecia) – Grants the power of living steel, turning the user into a fortress of destruction. (Boo's Fruit)

Chinjao clenched his fists, feeling the power coursing through him.

"Jason… This is beyond generous. We will not forget this."

Jason smirked. "Good. Train, grow, and in four years, call me. By then, I will be tearing through the New World, and you will have your chance to prove your worth."

He handed Chinjao a Den Den Mushi and a set of training manuals for advanced Haki and Rokushiki, ensuring the Hippo Navy would evolve into a force worthy of the Nexus Grand Fleet.

Two Months of Training & Expansion

Jason remained in Kano Country for two months, integrating Hasshoken into his crew's combat styles and overseeing the Hippo Navy's transformation.

During this time:

• His crew trained relentlessly, refining their mastery of vibrations and shockwaves.

• Jason explored nearby islands, uncovering 500 million berries worth of treasure, further expanding his fleet's wealth.

• He encountered a young Hina—under attack by pirates.

Recruiting Hina – A Different Kind of Loyalty

Jason didn't just save Hina. He took a strategic approach.

After annihilating the pirates with a single attack, he sat beside Hina and spoke of the truth behind the World Government.

"Do you think the Marines stand for justice?" Jason's golden eyes locked onto hers.

Hina hesitated. "They fight against pirates. They protect people."

Jason chuckled. "Then why do they obey the Celestial Dragons? Why did they let Ohara burn?"

Hina's breath hitched. She had heard rumors about Ohara, but…

Jason leaned in. "The World Government will mold you into their tool. But if you rise through the ranks under my command… you will have the power to change things from within."

Hina clenched her fists. Jason's words made too much sense.

Finally, she exhaled and nodded. "Fine. I will be your spy within the Marines. But if you lied to me—"

Jason smirked. "Then you'll have the power to judge me yourself."

As a sign of trust, Jason handed her a Devil Fruit.

Kinzoku Kinzoku no Mi (Metal-Metal Fruit) (Paramecia)

• Turns the user's body into living metal, vastly increasing durability and strength.

• Grants the ability to shift between different metal compositions (liquid metal for flexibility, hardened alloys for defense).

• Advanced users can generate and manipulate metal, forming weapons and armor from their own bodies.

Hina stared at the fruit before taking it. "With this… I will become strong enough to rise through the ranks quickly."

Jason nodded. "And when the time comes, you will be my blade within the Marines."

"Set sail. We have a revolution to start."