One Piece: SSS-Rank Haki at Age Seventeen

Three Realms: Ragnarok!!

Kaido's eyes burned crimson with fury, like blazing flames. His kanabo, wrapped in crackling black-and-red lightning, descended like a bolt from the heavens!

In that instant, a powerful sense of danger surged through Luffy's body. Every muscle tightened, as if a bowstring had been pulled to its absolute limit.

He immediately withdrew the punch he had thrown, crossing his arms before him.

His forearms shone with a diamond-like black sheen of Armament Haki, forming an unbreakable shield.

Yet his gaze toward Kaido was filled with excitement.

BOOM!!

A violent shockwave erupted like a volcanic explosion. Dense lightning bolts intertwined and raged across the sky like silver serpents!

In an instant, a massive crater opened beneath Luffy's feet—as if the earth itself had been torn apart.

RUMBLE!!

The ground surged like a stormy ocean. Tremors rippled through it like giant serpents twisting beneath the surface, and all of Onigashima shook violently!

—Whoosh!

Luffy's body was blasted backward like an arrow. His feet slammed into the ground like falling meteors, carving deep trenches across the earth before he finally stabilized himself.

A trace of blood slipped from the corner of his mouth.

His arms trembled slightly.

"Just as expected… from the Strongest Creature in the World!"

But his eyes shone brighter than ever, blazing with wild excitement.

He could clearly feel it—

The bottleneck that had been holding him back… was beginning to loosen!

At the level of an Emperor-class fighter, even the smallest improvement was precious.

Most powerful fighters reached their physical peak around the age of thirty.

From thirty to sixty, they refined themselves like master craftsmen, polishing their mastery of Haki and battle experience until perfection.

In simple terms—

Before thirty: explosive growth like a rocket.

Thirty to sixty: slow refinement like a craftsman's careful polishing.

…Of course, there were always exceptions.

On the other side—

Kaido slammed into the ground like a cannonball. His body was covered in cold, dark cyan dragon scales, like armor forged from steel.

His vertical pupils locked onto Luffy like those of a predatory hawk.

"Kaido-san… forgive me."

King slowly descended beside him, guilt evident in his eyes.

As Kaido's right-hand man, needing his captain to personally step in and save him felt like the greatest humiliation.

"King. Move aside."

Kaido's deep voice rumbled.

King looked up—and froze.

The expression on Kaido's face was that of someone confronting a true equal.

A look of deep caution.

King's gaze grew serious.

So his instincts had been right.

Straw Hat Luffy truly possessed the power to fight Kaido head-on.

Kaido ignored King as well as Sasaki, Who's-Who, and Black Maria.

"Worororo!! Let me see what you're made of, brat!

You've got guts coming here to cause trouble on Onigashima!!"

Dragging his kanabo with one hand, Kaido burst forward like a teleporting thunderbolt. Purple-black lightning spread like a spiderweb around him.

"Then bring it on… Kaido-sensei!!"

Black lightning erupted from Luffy's body. His Conqueror's Haki roared like a storm as he charged forward at blinding speed.

"Thunder Bagua!!"

"Thunder God: Iron Fist!!"

BOOM!!!

It was like a meteor colliding with the planet itself.

The atmosphere tore apart instantly, as though split by an invisible axe.

Infernal hurricanes roared outward from the clash like raging dragons. The entire island of Onigashima trembled violently, as if it might collapse at any moment.

Lightning exploded from the collision, streaking skyward like countless silver serpents.

The sea of clouds above was blown apart, leaving behind a massive scar across the heavens.

"The sky… it split!!"

King's pupils shrank violently.

He instantly drew his sword and slammed it into the ground like an anchor, resisting the unimaginable pressure.

Staring blankly at the sky that had been torn open, a sense of insignificance welled up inside him.

The Four Emperors were truly monsters.

Immense Haki erupted like volcanic magma.

Both fighters were blasted backward like cannonballs.

But in the next second—

As if mirrored reflections, they stepped back simultaneously, digging their feet into the ground.

The moment they stabilized themselves, they roared forward again like charging lions.

Neither of their auras weakened in the slightest.

Instead—

They continued rising higher and higher, like flames growing ever more intense!

In a flash—

Kaido's figure exploded forward once again with thunderous speed.

"Roaring Thunder Bagua!!"

Luffy's fist shot forward like a cannonball, dragging black-red lightning behind it. His entire body crackled with black thunder as he struck like a war god.

BANG!!

The air shattered again, producing a sound like breaking glass.

"So he's stimulating his cells with lightning… boosting both power and speed dramatically. No wonder he's such a monster."

With just a glance, Luffy had already deciphered the principle behind Kaido's Thunder Bagua—a move capable of instantly defeating most Emperor commanders.

In many ways, Thunder Bagua was practically a power-level detector.

Aside from special cases like Marco the Phoenix, very few Emperor-level commanders could withstand a single blow.

Two figures streaked across the battlefield like lightning and phantoms.

Like two black dragons, they clashed repeatedly beneath the night sky.

Far away, the Beasts Pirates members couldn't even see their movements.

Even pushing their Observation Haki to the limit was like groping through total darkness.

CLANG!

BOOM!

First came the metallic clash of weapons.

Then a thunderous explosion.

Meanwhile—

Inside Luffy's mind, notifications rapidly appeared.

Conqueror's Haki +0.02

Conqueror's Haki +0.02

Armament Haki +0.03

Armament Haki +0.03

Observation Haki +0.01

Physique +0.02

Strength +0.03

Devil Fruit +0.05

Feeling the continuous growth surging through his body, Luffy's eyes burned with excitement.

A full-spectrum upgrade?!

As expected of a T0-level instructor—Kaido-sensei!

"Zeffa, Rayleigh, even that that fat guy in suspenders Queen… none of them compare!"

"From today onward, I officially declare Kaido the greatest teacher ever!!"

Elsewhere — Wano Country, Udon Prison

Rayleigh sat calmly on Queen's luxurious chair, leisurely sipping sake.

Around him, both Beasts Pirates and prisoners stared nervously, not daring to approach the old man.

At that moment, Trafalgar Law walked out carrying several pairs of high-purity Seastone handcuffs.

Seeing the scene before him, the corner of his mouth twitched.

Originally, the plan had been simple—

Rayleigh would cause chaos.

Law would steal the cuffs.

Then they would escape immediately.

But instead…

Rayleigh had gone full rampage.

Rayleigh took the Seastone cuffs and said casually,

" that fat guy in suspenders is pretty strong. He can be your sparring partner."

Law's eyes widened as he looked into the distance—toward Queen.

Blood poured from Queen's chest like a fountain.

A deep sword wound pierced straight through his torso.

Black-red lightning crackled within the wound.

Queen's face was pale, sweat dripping down his forehead from the intense pain.

But—

He was still standing.

Rayleigh always adjusted his strength depending on the opponent.

In his retirement years, he preferred not to kill, so the force and Haki he used against the three of them had been carefully controlled.

Originally, he expected all three to collapse unconscious.

But there had been an unexpected variable—

Queen.

The suspender-wearing fat man had far more resilience than expected.

"You've got to be kidding me!!!"

Queen roared in fury.

He might not recognize Rayleigh…

But he definitely recognized Law.

In Queen's eyes, Law was nothing more than a rookie pirate playing house in the Paradise half of the Grand Line.

How could someone like that compare to the handsome, powerful genius scientist Queen?!

"You think you can use me as a whetstone? Aren't you afraid you'll break your blade?!"

In an instant—

Queen transformed into a massive Brachiosaurus.

Rows of machine guns extended from the mechanical arms attached to his dinosaur body, locking onto Law.

The atmosphere instantly turned tense and explosive.

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