Chapter 154: Battle of the Four Emperors!!
"You damn brat! Yamato is my daughter!!"
Kaido's furious roar shook the heavens.
With a single step forward, the entire Onigashima trembled. The ground shattered into spiderweb-like cracks that spread for miles.
The power of his Conqueror's Haki and Devil Fruit surged together, converging into his kanabo—Hassaikai.
Black-purple lightning wrapped around the weapon, compressing violently as if draining every ounce of destructive power from the world itself.
"RAAAAH—!!"
The moment Kaido swung—
The condensed lightning detonated like a nuclear explosion.
A torrent of catastrophic energy ripped through the air and surged toward Luffy with world-burning force.
Luffy merely smiled.
"If I make a promise… I'll keep it. Even if it costs my life."
CRACKLE—!!
Black-red lightning erupted around him.
His Conqueror's Haki roared like thousands of thunder dragons, colliding with Kaido's purple lightning across the sky.
Two monstrous Yonko-level auras clashed violently in the air.
BOOM!!
Black lightning surged upward, forming a massive pillar of energy that pierced the heavens.
The Beasts Pirates stared in terror.
The world before their eyes seemed to lose all color—everything reduced to black and white.
Every pirate who had made it to Onigashima was an elite capable of using Armament Haki and Observation Haki.
Yet under the crushing pressure of this Conqueror's Haki clash—
Among tens of thousands of pirates, fewer than a hundred could remain conscious.
Before monsters of this level—
They were nothing but cannon fodder.
Luffy's aura continued rising endlessly.
Black-red lightning shot toward the sky.
Visible streams of Armament Haki spiraled around his arm like flowing steel.
Even the surrounding space trembled under the pressure.
His fighting spirit had reached its absolute peak.
Mind.
Body.
Technique.
All perfectly unified.
Without a single flaw.
"BREAK—!!"
Luffy threw a punch.
Conqueror's Haki roared like thunder as his fist generated a storm capable of tearing apart the heavens.
His black-red energy collided once again with Kaido's purple lightning.
"Damn brat!!"
Kaido roared, increasing the force of his swing.
The shockwaves expanded outward like a massive storm.
The ground for kilometers around cracked apart as waves of rock and soil surged upward.
But this time—
The balance had broken.
BOOM!
A massive figure fell from the sky like a broken kite.
Kaido crashed into the earth with catastrophic force, carving a trench dozens of meters deep and stretching for miles.
Dust and debris filled the air.
Kaido knelt on one knee.
His vertical pupils trembled in disbelief.
His right arm shook uncontrollably.
That punch—
Luffy had overpowered him.
Kaido stared at Luffy again.
The ferocity in his eyes intensified.
At first, the brat only wanted a good fight.
But ever since Yamato appeared—
His intentions had changed.
The brat wanted to defeat him… and take his daughter away.
"Worororo—!!"
Kaido burst into wild laughter.
"If you've got the guts… try it!!"
His Haki exploded once again.
Black-red lightning of Conqueror's Haki tore across the air like a spiderweb.
With a step—
Kaido shot into the sky like a streak of purple lightning.
The heavens darkened.
Storm winds howled across the battlefield.
Within the sea of clouds—
A colossal shadow slowly moved.
Lightning chains trailed behind its body.
Then—
A gigantic dragon head emerged from the clouds.
Horned like towering pillars.
Scales layered across its body, glowing dark blue under the lightning.
Its vertical pupils radiated terrifying pressure.
Kaido's Azure Dragon form.
"Kaido…!"
Even King the Wildfire couldn't hide his awe.
His eyes burned with near-religious devotion.
This was the monster he had chosen to follow.
The being standing at the top of the world.
Nearby—
Yamato clenched her fists so tightly that her nails pierced her skin.
This wasn't just a difference in strength.
It was a difference in species.
In this form, Kaido stood at the absolute top of the food chain.
The ancient beast's aura nearly suffocated her.
"ROOOOAR—!!"
Kaido roared.
The sound waves shook the clouds apart.
His massive jaws opened wide.
Within them—
A terrifying energy gathered.
"Boro Breath!!"
A massive crimson beam erupted from Kaido's mouth like a river of magma pouring from the sky.
It crashed down toward Luffy with world-burning heat.
"LUFFY!!"
Yamato broke free from her fear and rushed forward.
But the scorching shockwave forced her back.
Then she saw it—
Inside the pillar of flames—
Luffy was smiling.
WHOOSH!
Space trembled.
Luffy suddenly appeared above Kaido's dragon head.
Golden flames erupted around his body like a miniature sun.
The brilliant light drove away the darkness over Onigashima.
His right arm extended.
Burning flame patterns spread across his skin.
Armament Haki spiraled around his fist, compressing enormous energy.
The punch gathered power like a collapsing star.
"Trying to play with fire?"
"You're a hundred years too early for that, Kaido-sensei!"
He laughed.
Then punched.
"Gum‑Gum Fire Pistol!!"
"WHAT?!"
Kaido's pupils shrank.
The sense of danger exploded through his body.
But his enormous dragon body couldn't dodge.
BOOOOM!!!
The punch struck Kaido's head like a meteor.
The explosion sent the colossal dragon crashing down toward Onigashima.
A pillar of fire shot into the sky like a miniature sun.
Shockwaves spread across the clouds.
Golden flames illuminated the entire battlefield.
Even King and Yamato felt their scalps go numb.
"This level of fire…?!"
King's face turned pale.
Even the Mera Mera no Mi at full awakening shouldn't produce flames like this.
Yamato stared at Luffy in the sky.
Her emotions were complicated.
Admiration.
Awe.
And a hint of insecurity.
Was someone this powerful…
really someone who needed her help?
"Worororo!!"
Kaido's laughter erupted again.
He slowly stood from a massive crater.
His body was covered in burns and blood.
Many scales had been blasted off.
Smoke rose from his wounds.
But the fire in his eyes burned brighter than ever.
"Straw Hat brat… you've truly earned my recognition!"
His aura surged higher.
"Come!"
"Take the title of Strongest from my hands!!"
Kaido gripped Hassaikai with both hands.
Lightning exploded across the sky.
He launched toward Luffy like a purple meteor.
Thunder flooded the heavens.
All lightning condensed into his kanabo.
He locked onto Luffy.
Then swung.
"Great Vajra: Thunder Bagua!!"
The power of the strike was like a nuclear blast.
Even the pirates below couldn't breathe.
Luffy grinned.
"Isn't that just the same move with a fancier name, Kaido-sensei?"
Lightning and flames erupted from his fist.
Black-red Conqueror's Haki wrapped around it layer by layer.
He punched forward.
The two figures collided in midair.
For a moment—
The world fell silent.
Blinding white light swallowed the sky.
A hellish energy storm erupted outward.
Onigashima trembled as if it might collapse.
But then—
Kaido's eyes widened.
His kanabo…
was being pushed back by Luffy's fist.
Luffy's red eyes gleamed with exhilaration.
Defeating the once-unreachable strongest mountain—
The thrill of breaking his limits was intoxicating.
"Impossible!!"
Kaido roared.
"How can your power, speed, Haki, and physique grow this fast?!"
At their level—
Strength usually stabilized.
Improvement was nearly impossible.
Yet Luffy had transformed during a single battle.
Luffy smiled calmly.
"Kaido-sensei…"
"It's all thanks to you."
Kaido froze.
Because of him?!
Was the brat actually leveling up through fighting him?
There was no way.
He would never admit that.
"Kaido-sensei…"
"You're no longer my opponent."
BOOM—!!!
Luffy unleashed another surge of power.
The surrounding air was crushed into a vacuum.
Thunderclouds spiraled violently.
A massive energy vortex formed in the sky.
Kaido's body was blasted backward once again.
Like a collapsing mountain.
He crashed into the ground.
Mountains along the way were flattened by the impact.
Another enormous crater appeared on the battlefield.
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