One Piece: Strongest Justice

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Early the next morning, Atlas was already out in the Marine base training grounds, starting his daily workout. 

Truth be told, he missed those days when he had just joined the Marines, pushing himself to the limit every day out on the field...

"Yo, Atlas! Seriously, you've just gotten back, and you're already training like crazy. Don't you know how to take a break?" said Captain Randall with a teasing tone as he walked past and saw Atlas hard at work.

"Can't help it! I'm still too weak!" Atlas replied while swinging his longsword with practiced movements, the determination in his eyes undiminished.

"Man, you're one hard-working brat," Randall chuckled. 

"You know what? I've been feeling a little rusty myself. How about a sparring match to test your strength?" he said, cracking his thick neck as he grinned.

"Sure—but no flying slashes!" he quickly added as if remembering something crucial.

Atlas laughed a little at that. He was honestly feeling the itch to fight, too. 

Though he felt no one in the base could match him now, Randall was technically the strongest Marine stationed here. 

Sparring with him might teach him something. After all, Randall was older and had far more combat experience.

"Alright!" Atlas responded enthusiastically, following Randall to a wide-open area of the training grounds.

The moment they stepped into position, the nearby Marines, who had been watching with curiosity, became excited. 

After all, this was the legendary monster of the base, Atlas, facing off against Captain Randall! The sight of the port not long ago was still fresh in their minds.

They quickly started spreading the word, and in no time, a large crowd of Marines surrounded the training field, buzzing with anticipation.

"Heh, Captain Randall, you'd better go all out. Don't lose too fast," Atlas joked with a sly grin after scanning the growing crowd.

"Shut it, you cocky brat!" Randall barked back with a smirk, refusing to be outdone.

The two drew their blades and stepped forward. As their swords clashed, sparks flew into the air.

"Brat, your sword sure isn't as sharp as your mouth!" Randall grunted, straining as his muscles bulged and veins popped along his neck. 

The clash was starting to wear him down, but he refused to admit defeat.

"Oh yeah? Then try this one, old man!" Atlas shot back, never backing down from the verbal sparring.

One-Sword Style: Iris Slash!

Atlas took a step back, flexed his muscles, and delivered a powerful horizontal slash. His biceps and triceps tensed in unison, unleashing a heavy blow toward Randall. 

Of course, Atlas held back a bit—he didn't want to send the captain flying with a single hit and cause unnecessary trouble.

But Randall wasn't someone to be taken lightly. He raised his blade vertically and effortlessly blocked the attack.

"Hahaha! That's all you've got? Didn't eat breakfast, did you? Come on, keep it coming!" he taunted, trying to hide how much that strike had rattled him.

Damn it, what is this kid eating? he thought to himself. He's ridiculously strong!

Atlas subtly noticed Randall's right hand trembling slightly. Deciding to give the old man some dignity, he held back even more.

To the surrounding Marines, none of this was visible. They thought it was an even match and cheered wildly.

"Bring it on, brat!" Randall roared, hyping himself up as if giving himself a power-up.

Boom! Another direct clash. This time, Atlas's standard-issue Marine longsword began to show cracks. 

Not surprising—this sword had followed him through countless battles and wasn't a famous blade. The fact that it had lasted this long was already a testament to its quality.

"Hahaha! Looks like your sword's about to give out!" Randall laughed, noticing the fractures. 

He didn't need sharp eyes for that—his experience told him from the sound of the impact alone.

"Don't worry, Captain Randall," Atlas replied coolly. "It'll hold long enough to beat you."

One-Sword Style: Brave Bird!

A straightforward thrust aimed directly at Randall—simple, powerful, overwhelming!

Randall raised his sword horizontally to block, but a white mark appeared instantly on the blade. He winced. 

This wasn't just a weapon to him—it had accompanied him through most of his Marine career. While not a named blade, it was far superior to a standard-issue sword.

"Brat! Now I'm getting serious!"

With a determined glare, Randall gripped his sword with both hands, ready to absorb the full force of Atlas's attacks.

Soru! In an instant, Randall vanished from Atlas's sight, leaving only a blurred afterimage.

It was one of the Six Powers of the Marines—Soru. Randall hadn't fully mastered the Rokushiki techniques, managing to learn only two of them at a beginner level. 

But they were still enough to gain an edge over Atlas, who hadn't formally trained in the Six Powers yet.

Still, Atlas's body had developed to the point where he could already meet the physical requirements. His explosive speed was already beyond that of ordinary humans, but the Rokushiki techniques were about surpassing human limits. 

So for now, Randall's speed edged him out slightly. But not for long. 

Kenbunshoku Haki—Activated. Target locked!

Using Observation Haki, Atlas instantly sensed Randall trying to circle behind him. He grinned.

Advance instead of retreat—One-Sword Style: Rainfall!

This was a newly developed technique: a vertical downward slash infused with immense force and kinetic energy, creating three phantom slashes that descended on the enemy like a torrential storm.

Randall became the first unfortunate test subject for Atlas's new move. Just the pressure from the incoming attack weighed heavily on him.

But then—

Clang!

Atlas's sword shattered mid-attack, the already damaged blade unable to handle the force of Rainfall. Shards of metal scattered like falling leaves.

"Well, brat! Looks like you're done for now!" Randall laughed, relieved and triumphant.

Atlas only smiled. He clenched his fists, revealing thick layers of calluses that looked like armored gauntlets—intimidating and solid.

"Who says you need a sword to fight? I've got hand-to-hand combat too, Captain."

His smile was meaningful.

Though Atlas had spent years honing his swordsmanship, giving the impression that he was only a swordsman, that wasn't the whole story. 

He wasn't emotionally attached to the way of the sword like some warriors. To him, swordsmanship was just one path to strength; hand-to-hand combat was another.

His training never neglected it. Day after day, he threw punches—first into the air, then against hard surfaces.

He had modeled this training after Garp's, who once flattened eight mountains with his bare fists to toughen up for breaking Don Chinjao's legendary head.

Atlas couldn't quite reach that level, but leveling small hills was no problem.

Randall didn't hesitate either. He slashed at Atlas with one last attack. But Atlas didn't foolishly meet the blade with his bare hands. 

Instead, he subtly shifted his body and slammed his fist into the side of the sword, nearly knocking it from Randall's grip.

Before Randall could react, Atlas stepped in and delivered a solid shoulder strike that sent the older Marine flying.

Without using Rokushiki, Randall couldn't match Atlas in strength, speed, explosiveness, or reaction time. 

The only reason he'd lasted this long was because Atlas had been holding back.

"Brat… you're not cute at all," Randall groaned, pulling himself up and walking back toward Atlas.

He didn't seem seriously injured.

"But I've still got one more move you haven't seen!"

Atlas could tell what Randall was trying to do—he wanted to teach Atlas Rokushiki through combat. It made sense. 

Atlas's raw power was enough to carry him, but if he learned the Six Powers, his strength would reach another level entirely.

Boom! Boom! Boom!

The two exchanged a flurry of blows, Randall now abandoning his weapon completely.

His sword skills weren't strong enough to count as a true swordsman, and the blade put him at a disadvantage against Atlas. Plus, he was worried Atlas might break it.

So he gave up the sword and went all-out in a brawl.

"Now this is what real men do—fist to fist! Hahaha!" Atlas roared with laughter, fists raining down on Randall like a storm…

—Two Hours Later—

"Iron Body!"

Captain Randall shouted as he braced himself, every muscle in his body tensed, taking Atlas's punch head-on. 

His face flushed red from the impact, and then he dropped down onto the ground, clearly worn out. He blocked it—but not entirely. 

It was obvious that Randall hadn't fully mastered Tekkai and couldn't completely withstand Atlas's blow.

Old man Randall... Don't you know how many Marines have died relying on half-baked Iron Body? 

What you guys call 'Tekkai' can't even be called that, Atlas thought to himself, silently criticizing.

"Atlas, you little punk—what disrespectful thing are you thinking about now?"

Defeated, Captain Randall glared at Atlas suspiciously.

"Huh? Me? No way! I respect you a lot, Captain Randall!" Atlas replied with a half-hearted laugh.

"Did you at least catch all the moves I just showed you, brat?" Randall's forehead twitched in irritation at Atlas's unserious attitude.

"Of course I did! Don't underestimate me, old man."

Within Atlas's Observation Haki range, Randall's every move had been crystal clear. 

Techniques like the Rokushiki—once your body meets the physical requirements and your talent is decent—aren't too hard to grasp at an entry level. 

During their fight, with the help of his Observation Haki and excellent learning ability, Atlas had already seen through Tekkai and Soru completely.

Tekkai, or Iron Body, involves rapidly increasing blood flow and muscle tension to harden the body like steel. 

But it has a big drawback—once activated, the user can't move. Of course, that's only true for those who haven't mastered it. 

With enough training, it's possible to move while using Tekkai.

Soru, on the other hand, allows for high-speed movement by stomping the ground dozens of times within 0.36 seconds, generating explosive propulsion.

In battle, it's practically overwhelming when used effectively. After pondering the training method for Soru, Atlas activated the muscles in his legs. 

In an instant, the pressure from his explosive strength tore his pant legs into dangling shreds. The well-defined muscles of his legs twisted like tempered steel. 

Then he began stomping the ground at high speed, creating deep cracks under his feet. 

Suddenly, Atlas vanished from Randall's sight—

BOOM!!

He crashed straight into a distant wall, creating a human-shaped hole on impact. 

Covered in dust, Atlas crawled out sheepishly and said, "Uh... Sorry. That was my first time trying it. Still getting used to it."

"Atlas, you damn brat!! The cost of fixing that wall is coming out of your paycheck!"

Randall shouted in frustration. He was truly shocked by Atlas's raw talent. 

It was bad enough that the kid learned just by watching, but the first time he used it, it was faster than Randall's own? What the hell?!

"Oh... uh... owww…" The Marines watching nearby were stunned into silence, letting out awkward murmurs in awe.

"Atlas, sir! I want to spar with you! Please accept my challenge!"

At that moment, a white-haired boy drenched in sweat pushed through the crowd and bowed earnestly to Atlas. That boy was none other than Smoker.

As soon as he spoke, the rowdy Marines instantly went quiet, all turning their eyes toward him. 

Who was bold—or crazy—enough to challenge Atlas right now? Either this kid had nerves of steel or was confident in his strength.

But when they realized it was that kid—Smoker—their expressions turned to excitement and anticipation...

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