Iron Fist vs. Black Arm!

"Bang--!"

The moment fists collided, the air exploded, like several Impact cannons roaring simultaneously!

The ground shattered, debris flew everywhere, and two figures flashed past each other, their fist shadows so dense they were almost invisible!

Zephyr's steps were as steady as a mountain, and his right fist swung out like a hammer, bringing with it a violent shockwave!

"Not bad, Luffy! But it's not enough!!"

"Bang! Bang!!"

The sounds of fists pounding against flesh filled the air as the two Martial Arts -to-hand, a hard-hitting "Iron Fist" close-quarters battle!

"Grandpa's Iron Fist..." Luffy gritted his teeth and charged forward to meet the ferocious attack!

"It's not just that bad!!"

His arm was taut, his muscles bulging, and black Armament Haki Zephyr, which was imbued with the Haki of Black Arm!

"Boom--!"

With a loud bang, the ground beneath their feet completely collapsed, and amidst the flying sand and gravel, their figures darted away at lightning speed!

Garp's personally taught Iron Fist Martial Arts are simple, brutal, and domineering. Every strike is like a mountain collapsing and the sea splitting, carrying a fierce wildness!

Zephyr's Black Arm Fist is steady, powerful, and imposing, with each punch, made with ultimate Armament Haki, feeling like a torrent of steel crashing down!

The naval cadets around the Training Ground were all stunned, stopping their training and standing there speechless!

"Boom! Boom! Boom--!"

The force of the punch swept across the field, Shockwaves surged in all directions like a tidal wave, even causing the walls of the Training Ground to crack!

Standing on the sidelines Ace crossed his arms, a twitch at the corner of his mouth. "This kid... his Martial Arts really was honed under Garp's tutelage..."

Nami gripped the railing tightly, her eyes filled with anxiety. "Can... can he win...?"

Zoro grinned, his fighting spirit ignited. "Winning or losing isn't important... but this fist-to-fist fight will definitely be amazing!"

Usopp huddled up to the side, muttering, "I'm going to die... Are those two even human?"

Sanji lit a cigarette, his lips twitching. "We're incredibly lucky to have escaped Zephyr's fists alive..."

Just then!

Zephyr's punching style suddenly changed, and his aura surged!

"Black Arm - Mountain Breaker!!"

"Boom--!"

This punch seemed capable of shattering even the sky!

Luffy's pupils contracted, and he crossed his arms to take the hit head-on.

"Bang--!"

He was blasted dozens of meters away, his feet carving two deep furrows in the ground!

"So strong... As expected of Teacher Zephyr!!"

Luffy slowly straightened up, a wild smile spreading across his face.

"Zephyr- sensei... I'm going to get serious from now on!"

"Boom--!"

A scorching wave of heat erupted, like a live volcano exploding!

Pink Dragon Flames surged from Luffy's body, causing his form to expand rapidly and his bones to crackle and pop!

His muscles bulged, his arms were covered in dragon scales, and a pinkish-gold light appeared on the back of his hands;

The spine extended, and a Dragon Tail whipped through the air, sweeping across the rubble with a deafening roar! Its pupils had transformed into sharp, vertical slits!

"Roar--!"

The dragon's roar shook the heavens, making the entire Training Ground buzz! Everyone watching from the outside of the Training Ground stared wide-eyed!

Luffy was enveloped in dragon flames and his Haki resonated, a shockwave bursting from his feet as he transformed into a streak of pink lightning and charged forward!

"Dragon Bone - Meteor!!"

A powerful punch was unleashed, carrying the force of a hammer falling downwards!

"Boom--!"

Zephyr took the blow head-on, but was still thrown back several meters, the ground cracking like a spider web!

He shook his numb arm, a wide grin spreading across his face. "Good lad! Now that's more like someone who inherited the Iron Fist!!"

They roared almost simultaneously and rushed into each other's arms again!

Fists flew like thunder, Haki clashed, and Dragon Flames surged like waves; the Training Ground was like the epicenter of an earthquake!

Boom! Boom! Boom!!

The fists rained down with ferocious force, the Dragon Claw Fist and the Black Arm Fist intertwined, each strike powerful enough to shatter a giant rock!

The onlookers were stunned and stood frozen in place.

"Boom! Boom! Boom--!"

The intense clash between Luffy and Zephyr has lasted for several tens of minutes, with every punch landing hard and without any fancy moves.

Luffy was covered in wounds, and his arms trembled slightly from taking the blows of Zephyr's Black Arm Iron Fist repeatedly, but his eyes still burned with fighting spirit.

A smile played on Zephyr's lips, and a rare look of satisfaction shone in his eyes.

"Not bad, you brat..."

"Bang--!"

The two clashed head-on once again, their fists exchanging blows, the thunderous roar of their Iron Fists sending dust flying throughout the Training Ground!

Luffy swung his dragon tail violently, his figure flashed and he leaped into the sky, dragon flames surged, and Armament Haki burned like flowing fire on his fists.

"It's the final blow, Zephyr- sensei!"

"Dragon Bone - Meteor Fall!!"

With a roar of dragons, he swooped down from the sky, his fists carrying pink Dragon Flames, converging into a mountain-like sense of oppression!

Zephyr's arms were covered in ultimate Armament Haki as he gathered his strength and let out a low roar:

"Black Arm - Heaven Breaker!!"

"Boom--!"

Fists collided again in the center of the Training Ground!

The terrifying Shockwave created several layers of air waves, completely overturning the surrounding stone bricks, and the students watching from all sides were shaken back several steps!

Amidst the billowing smoke and dust, a figure was blasted away by immense force, crashing heavily into the ground and creating a deep crater!

"Boom--!"

As the dust settled, everyone could see clearly—

It's Luffy.

He lay sprawled in the center of the pit, his body battered but not unconscious, his fists still clenched tightly, his eyes burning with an indomitable fighting spirit.

Zephyr slowly withdrew his fist, letting out a heavy breath, then burst into loud laughter. "Haha!! Luffy--!"

"That's really impressive!! To be able to fight me for so long using only Martial Arts..."

"You've really gotten bolder!!"

The marines around the Training Ground erupted in applause and exclamations, and some even whistled.

"Luffy!!"

"This battle... was absolutely breathtaking!"

"A kid who can hold out against Professor Zephyr for so long... This is the first time I've ever seen one!"

Luffy gritted his teeth and, supporting his cracked fists, slowly climbed out of the deep pit.

"Teacher Zephyr--!"

His face was bruised, but a determined smile played on his lips, "I... will continue to strive to become stronger!"

"Next time, I will definitely defeat you!!"

The Training Ground was completely silent; everyone held their breath.

Zephyr looked at the boy in front of him, his gaze gradually softening.

"This kid... he can fight me to this extent using only Martial Arts..."

"If he fully unleashes the power of Mythical Zoan and uses its wide-range Devil Fruit destructive power..."

"I'm afraid even I'm starting to have a headache..."

Thinking of this, Zephyr nodded slowly, his eyes revealing pride and anticipation.

"Good lad... you'll become a real monster."

Just then--

"Luffy--!"

Nami rushed forward and pounced on Luffy's side, anxiously checking his injuries.

"You! You're covered in wounds!! Don't you know how to defend yourself?! Are you trying to scare me to death?!"

Luffy heartily and waved his hand. "Hahaha, it's nothing, it's nothing! I'm used to it..."

And, I'm so happy to have played with Zephyr- sensei for so long!

Not far away, Sanji lit a cigarette, his gaze serious. "This is Luffy's strength... to be able to hold his own against Zephyr for so long..."

Usopp's face turned pale, but he couldn't help clenching his fists. "We... we need to work even harder!"

Ace stood quietly to the side, his eyes gleaming with the pride unique to an older brother:

"Luffy... he's really impressive."

Just as everyone was still immersed in the afterglow of the battle, a familiar, hearty laugh suddenly rang out:

"Haha-- Luffy, well done!"

Everyone was stunned and turned to look.

A familiar, tall figure walked slowly towards them, his face, bearing a cynical smile, revealed in the sunlight.

Almost everyone exclaimed in surprise at the same time:

"Brother Roy!!"