Brothers United, Couple Combined

"Ten thousand against fifty thousand, and simultaneously facing two of the Four Emperors..."

"This time, that person has gone too far, hasn't he?"

Beside Onigashima, where the fighting had already reached a stalemate, three masked men in white suits stood on the sea. The Five Elders had not only given them orders to obey Roman, but also another secret mission:

If danger arises, immediately protect Roman and evacuate. If you fail, you will be executed!

"Even if we charged into that kind of battlefield, our fate would be uncertain, wouldn't it?"

Faced with his colleague's helpless words, the leader of CP0, a man with Byakugan and a mask, shook his head.

"Calm down. It seems the coalition brokered by that sir isn't without a chance of victory. Their numerical disadvantage isn't immediately apparent, and the number of officers on both sides is roughly equal. The key lies in—"

"The key is when Luffy will defeat Kaido!"

Once the commander falls, it can be a decisive factor in the morale of both sides, which is why Roman rushed to the front to warn Luffy.

"Leave it to me!"

Luffy patted the Straw Hat crew, looking carefree and grinning.

"And Ace is there to help me too~~"

"... It's rare that you're willing to ask for help, but we can't be careless."

"Kaido is a legendary pirate who has been famous for decades. And unlike the Golden Lion and the Red Earl we've encountered before, he doesn't have the burden of injuries or old age."

"Rest assured--?!"

"Get out of the way!!"

The instant Luffy spoke his warning, Roman had already shoved Nami aside with one arm around her, and a transparent door appeared out of thin air, causing the two figures to vanish instantly.

At the same time, Luffy lunged to the side, grabbing a large group of his crew members and pulling them aside. The next second:

"Hakai!!" x2

The overwhelming force, indistinguishable to the naked eye, surpassed all means of observation! A circular crater, hundreds of meters in diameter, suddenly appeared and swept across the entire battlefield! Buildings, trees, the earth... even the sea was instantly 'carved' into a gigantic semi-circular crater that disappeared below the horizon!

Everyone in that path of attack—whether they were elite Beasts Pirates, samurai from Wano Country, or members of the Whitebeard Pirates —vanished without a trace, as if erased by an eraser!

No, there were still a dozen or so broken figures left behind. Most of them were members of the Whitebeard Pirates had survived only because Marco had shielded them, their bodies tattered and battered. A few figures who appeared to be Wano Country samurai... were already half-dead.

"Yagyu Mansion Master——?!"

"That is... Lord Baili..."

It was obvious that these people were all highly respected experts in Wano Country; otherwise, they wouldn't have been recognized so quickly despite being battered and bruised. As Ace leaped over and stood beside Luffy, Roman also emerged from thin air, carrying Nami, and 'pushed open the door,' all looking at the end of the attack with grim expressions.

That was the towering main building of Onigashima. Now, a huge hole appeared at the main entrance, and two tall figures walked out, each surrounded by a group of people:

Artificial Devil Fruit user, True Striker, the Six Sons, the All-Stars;

Perospero, Daifuku, Cracker...

"Holy crap, you only killed two thousand people? Kaido, has your strength declined?"

As a user of the Soul-Soul Fruit, Big Mom could clearly see the number of newly deceased souls with just a glance. She felt somewhat dissatisfied with her and Kaido's previous 'Combination Technique'.

"Hmph, how many years has it been since we used this move together? Linlin, how dare you blame me?"

Kaido, carrying a spiked club, stepped forward:

"Luffy kid, get out of here—?!"

In that instant, a fist covered in Haki struck Kaido with Inazuma! It slammed into Kaido's face with a loud thud, silencing him.

"Kaido, I'm going to beat you to a pulp!!"

Only Luffy would do something like slapping Four Emperors in the face in front of tens of thousands of people! Of course, this also boosted the morale of the Straw Hat Grand Fleet had just lost two thousand men in one blow.

As long as the leader hasn't fallen, there's always a chance to turn the tide!

Only:

That's a monster! He took down so many samurai with a single move, even the masters who were just barely on their way to becoming great swordsmen...

Kaido, who had been knocked backward by a punch, slowly straightened up and looked down at Luffy opposite him.

"I thought it was that brat? Isn't he the one I defeated a few days ago? I beat him so badly he needed someone to carry him to safety, and now he's back to die?"

"I am not the same person I was before!"

"That's right, because this time we brothers are fighting side by side!"

?!

If Luffy's words made Kaido think it was just a case of "a newborn calf not being afraid of a tiger," then the person next to him made Kaido's face show a hint of surprise.

"... It's you, Roger's son, Gol D. Ace!"

"How did you manage to survive Marineford?"

Forget about Ace, even if his own father Roger were resurrected, he'd enter Marine Headquarters upright and leave sideways! Could this person before us...?

"You're wrong, I am Portgas D. Ace."

Ace met the gaze of the man in front of him, who bore the title of one of the Four Emperors, without fear and introduced himself without hesitation.

"My father is Edward Newgate, and my mother is Portgas D. Rouge. I have absolutely no relation to that man named Roger. The only person standing here today is the acting captain of the Whitebeard Pirates! Luffy's brother!!"

Roger: It was quite sudden...

"Oh my god, I see!"

Big Mom, standing next to Ace, looked at him with great interest. "So you're that 'Asa'? No wonder even I couldn't find out where you, the acting captain of the Whitebeard Pirates, came from. You're Roger's dead son!"

"That's Big News," Big Mom said, quoting a famous line from Morgans, the head of the World Economic News. "This intelligence will definitely fetch a good price! But I'm more interested in how you escaped from Marineford War ..."

"That might disappoint you. My father and brothers pulled me back from the Sanzu River. And—"

Tear!

At this point, there is no longer any need for pretense.

Ace ripped off his shirt, revealing his muscular upper body, and then:

Thump, thump, thump, thump-thump, thump-thump-thump!!

As the dense, drum-like sounds resounded across the battlefield, the expressions of the elite Beasts Pirates around them changed.

"Damn it, it's Aisa's 'Emperor Engine'..."

"Damn it! I already told you this guy is Ace! And Kaido is right here, what are you afraid of?"

On Ace's chest, jet-black lines spread outwards from his left side! His heart, rendered black by Armament Haki, pounded wildly within him, providing inhuman power to his body! A terrifying power far exceeding Luffy Gear Second!!

"Ace, you've become much stronger."

Ace smiled gently at Luffy's sentiments.

"Luffy, you've actually gotten much stronger!"

He's already surpassed me and is truly charging towards the throne of 'King of the Pirates'! Not just paying lip service. So, let me, his older brother, lend you a hand—

"Here we go, Luffy!"

"Oh, Ace!"

In an instant, Ace, who had activated the 'Emperor Engine,' and Luffy, who had entered Luffy Fourth Gear, vanished from their spots! The next second, Kaido, who was standing in front of the Beasts Pirates, also disappeared instantly, leaving only the spot where he had stood, where an explosion shot into the sky!! At the same time, a series of explosions rapidly spread across Onigashima, making everyone present realize what had happened.

"Hey, are you kidding me? That's Guotou way too far..."

One of the six, Who's-Who, didn't even notice when the cigarette in his mouth fell out. He had originally planned to cause trouble for the Straw Hat Kid because of an old grudge, but now it seems:

Thank goodness I didn't go, otherwise I would have been beaten to a pulp in no time.

"So, next—"

Roman glanced at Kaido, who was locked in Luffy Ace. After so much preparation, it was time for him to make his move.

"Nami, are you ready?"

"This time, we're going to take on the Four Emperors head-on!"

Faced with Roman's question, the girl, having untied the "Thief's Secret" booklet, tucked her little finger behind her ear and nodded.

"As long as I'm with Roman, I don't care if I fall into the Sanzu River."

Roman shook his head at Nami's answer.

"You won't fall in, because I'll carry you across the river."

You two—

Amidst the envious expressions of the other Straw Hat crew members around him, Roman simply picked Nami up and placed her on his shoulders, and then:

Splash splash~~

Sheets of white paper flew out, rapidly transforming from a two-dimensional plane into a three-dimensional structure! Like a true giant, it swiftly assembled bones, tendons, and a heart in the air... Those around could even hear the fiercely pounding heartbeats, like the war drums of an ancient giant, filled with an incredible, surging, wild, and earth-shaking power.

Various Devil Fruit abilities flashed and combined on this giant's body. At the same time, Roman's Haki also acted as the regulating hub, integrating and connecting everything. His domineering, indifferent, arrogant, and powerful aura was greatly enhanced by the Devil Fruit ability, as if an invincible king had descended once again, and a huge oppressive force that stood above all living beings arose!

In the blink of an eye, a 'White Knight' standing over ten meters tall appeared. Every line on his magnificent armor exuded boundless power and beauty. With each breath beneath his mask, he stirred up a small hurricane. His domineering and cold-blooded Haki soared into the sky.

At the same time, a magnificent throne appeared on the knight's shoulder, and Nami emerged from it, now dressed in a splendid robe, her head adorned with a crystal crown and intricate gemstones of various colors. The "Thief's Intent" in her hand scattered, transforming into rings of colorful papers that danced around her!

In the hands of the enormous White Knight, a longsword of equal size Inazuma black patterns like lightning; on a massive shield were two hands that crossed their middle and index fingers to form a gesture of rejection.

This time, it's not just a simple creation of superpowers. This Great Knight was created by Roman using paper imbued with his own power to simulate the microscopic structure of the human body, and then integrating all of it with his Haki!

Its skeleton is formed from its Paper-Paper Fruit ability, its muscles and blood vessels from its Rubber ability, its heart from the clash of Magma-Magma ability and Ice-Ice ability, its nerve transmission from its Rumble-Rumble Fruit, its armor from its Diamond ability, and its Momo ability to amplify everything...

Meanwhile, the 'blood vials' accumulated over a year continuously provided the power, forming an external armor with overwhelming strength and numerous additional functions. It not only amplified Roman's strength to its limit but also enabled him to exert effects exceeding those of the original ability user.

In other words, what's standing here now isn't just two people, but a group of top-tier ability users!

"Combination Technique: All-Rounder Knight!" x2

As the tall knight stepped forward, his soaring aura was in no way inferior to anyone else on the battlefield.

"Mmm, this is interesting!!"

Locked in by the aura of the All-Rounder Knight shimmering with diamonds, Big Mom gripped Napoleon tightly, leaping onto Zeus, Prometheus coiling around her hair and transforming into a blazing cloak! She was clearly now in full battle mode.

"You actually want to fight me one-on-one? Fine, I'll grant your wish!!"

A great battle between two individuals with unparalleled and complex abilities is about to erupt!