The vast casino was suffocatingly quiet.
A killing intent-filled pressure hung in the air.
The once-noisy gambling hall now had fewer than a dozen people still conscious.
Among them were the three top officers of the Donquixote Family.
Sensing the murderous atmosphere, all three looked tense.
"Young Master… can he win?"
Diamante lowered his voice, worry written across his face.
"His opponent is Fist Demon Kai—the monster who personally captured Whitebeard Jr."
Before anyone else could speak, Trebol, Doflamingo's most loyal fanatic, immediately said, "With the Young Master's strength, he will definitely win."
"Even if his opponent is Fist Demon Kai…"
"Against the Young Master of the Donquixote Family, he will still be defeated!"
"Few people on this sea can compare to the Young Master."
"Don't forget, the Young Master has awakened his Devil Fruit!"
Hearing that, Pica and Diamante's worries eased slightly.
Their eyes remained fixed on the battlefield.
At the corner of the casino, near the wall, the five pirates with bounties of forty to fifty million berries trembled under the crushing pressure.
"Are they about to fight?"
"A duel between the Young Master of the Donquixote Family, Heavenly Demon Doflamingo, and the strongest genius in Marine history, Fist Demon Kai?"
"Which one of them is stronger?"
Magician Finks asked in a trembling voice.
"Hard to say."
Luke shook his head, his expression still tense.
"Both of them are top-tier monsters of the sea."
"Once they clash…"
"This entire casino might be destroyed before they even decide a winner."
"And by then, we might already be dead from the shockwaves."
Hearing that, the other pirates grew even more afraid.
"Doflamingo should win, right? He became famous across the sea years ago."
"As for Fist Demon Kai… no matter how strong he is, he's still only five years old."
"Even if he captured Whitebeard Jr., I still feel Doflamingo has the edge."
They whispered among themselves.
But when their eyes fell on Kai and saw the savage demonic pattern across his back, their confidence wavered again.
The pressure Kai radiated was far too intense.
For a moment, none of them dared judge who was stronger.
In the middle of the battlefield, Doflamingo narrowed his eyes as he stared at Kai's muscular upper body.
Beneath his sunglasses, his gaze carried a rare trace of seriousness.
"This brat…"
"He really is a terrifying monster."
The pressure coming from Kai made even Doflamingo feel shaken.
As expected of someone who had captured Whitebeard Jr.
He was terrifyingly strong.
"But I'm not some trash like Whitebeard Jr."
"Brat…"
"You dared cause trouble in my casino? Then you'd better have the strength to back it up."
Doflamingo took a deep breath and suppressed every stray emotion.
He raised his head and stared coldly at Kai.
Out of the corner of his eye, he saw the countless threads he had already spread through the air.
They were arranged like a spiderweb in every direction.
The threads were incredibly thin, almost impossible to see with the naked eye.
Each one carried terrifying killing power and destructive force, and they were extremely tough.
Even under tremendous force, they would not easily snap.
That was because Doflamingo had already developed his String-String Fruit to an astonishing level.
If someone else had eaten the same fruit, they could never have brought out such terrifying power.
Nor could they make every thread so resilient and deadly.
In the oppressive silence—
The battle suddenly began.
Doflamingo attacked first.
"Bullet String!"
With a low shout, he flicked his index finger.
An invisible thread shot toward Kai like a speeding bullet.
Its speed was terrifying.
Whoosh!
A sharp sound tore through the air.
It seemed as if even space itself was being pierced.
"It's here."
Kai narrowed his eyes.
If he relied only on his naked vision, he could barely catch a blurred afterimage of the thread.
He could not see it clearly.
So, fighting Doflamingo could not depend on eyesight alone.
In this situation—
Haki was necessary.
"Observation Haki, activate."
With a thought, Kai released his Observation Haki.
An invisible field spread outward from his body, covering a five-hundred-meter radius.
Everything within that range became clear to him.
Every movement, every tremor, every subtle change in the air was magnified countless times and imprinted in his mind.
Doflamingo's every action, no matter how small, was exposed.
Kai tilted his body slightly.
The bullet-like thread brushed past him, leaving only a sharp gust of air that stirred his hair.
Finally—
Boom!
Behind Kai, more than ten meters away, a wall was pierced through.
A thumb-sized hole appeared in the structure, as if it had been shot through by a real bullet.
From inside the casino, one could even see the outside through the hole.
A terrifying attack.
Doflamingo's Bullet String possessed frightening penetration power.
If it struck a human body without Armament Haki defense, it would likely pierce straight through flesh and bone.
"You dodged?"
Doflamingo remained expressionless.
It was only a probing attack.
He had not taken things seriously yet.
Kai dodging so easily was within his expectations.
If Fist Demon Kai, the strongest genius in Marine history, could not avoid such a casual move, then he would not deserve his reputation.
Someone who could capture Edward Weevil could not possibly be simple.
After several probing attacks from Doflamingo, Kai finally became serious.
"Since you've gone all out…"
"It's only polite that I respond properly."
"Otherwise…"
"You might think I'm looking down on you."
Kai smiled faintly.
In the next instant, the power inside his body surged wildly.
Boom!
A tremendous force rushed through his limbs, bones, and meridians.
Then a layer of pitch-black liquid-like substance appeared, wrapping around both his arms and spreading rapidly.
His arms turned black as ink.
Moments later—
The liquid hardened.
The black substance solidified into armor, covering Kai's arms completely and radiating a sharp, oppressive aura.
Unbreakable.
Heavy with pressure.
It looked like hardened liquid ink.
In truth, this black armor was harder than diamond.
"Armament Haki, activate."
Kai's lips curved.
With Armament Haki coating his arms, the strength within them rose sharply.
Once that power erupted—
It would shake the world.
"Doflamingo, our fight…"
"Starts now."
"Next…"
"Don't disappoint me."
Kai stared calmly at Doflamingo.
As Kai activated Armament Haki, Doflamingo's gaze grew even more solemn.
He could sense it clearly.
Kai's Armament Haki was extremely powerful.
This was not the level of someone who had merely learned the basics.
"A five-year-old brat…"
"Not only does he possess terrifying Conqueror's Haki, but even his Armament and Observation Haki have reached this level?"
Doflamingo's eyes filled with wariness.
He had to admit it.
Fist Demon Kai was truly a terrifying existence.
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