Chapter 1 – Kaido Grants a Marriage, the System Has Arrived!
Onigashima Island.
Beneath the giant skull dome of Wano Country, a never-ending feast was in full swing.
The deafening roar of celebration nearly shook the stone ceiling apart.
"Bring me another cup!"
"Hey! Roast that Sea King's leg until it's cooked through and bring it here!!"
"Wahahahaha! Drink!"
The air reeked of alcohol, scorched meat, sweat, and blood—blended together into a pungent fragrance that defined the Beasts Pirates.
Around the banquet hall, the Gifters—their bodies twisted with the traits of beasts—drank from cups the size of buckets, slamming them together with manic laughter. Golden liquor splashed through the air in shining arcs.
It was a den of chaos, a nest of wild animals without a shred of order.
And yet, in the midst of that madness, there was one figure who stood out completely.
Right beneath the grand throne where Kaido sat like a living mountain—beside the three massive seats of the All-Stars—there was a fourth seat.
Its owner was a young man with black hair and equally black eyes—
Akira.
Only eighteen years old, his face was calm and handsome—an unsettling contrast to the monstrous visages around him. He sat quietly, head slightly lowered, polishing the long katana in his hands.
Within a radius of three meters, no one dared to approach.
He wore a simple black training outfit, but beneath that thin fabric lay muscles as solid as carved stone—the result of eighteen relentless years of training in hell.
A drunken Gifter stumbled, nearly stepping into Akira's area. But his friend, still barely sober, yanked him back in panic.
"Are you insane?! Do you have a death wish?!"
"Eh? Isn't that the Fourth Commander?"
"You're too drunk, idiot! Lord Akira hates it when someone gets near him while he's cleaning his katana!"
Cold sweat instantly drenched the drunkard's back. Half his drunken haze vanished at once.
The young man didn't utter a word—just kept wiping his blade—but the invisible pressure radiating from his body was far more terrifying than the roars of the half-beasts around him.
He was the Fourth Commander of the Beasts Pirates—a monster without a Devil Fruit, who'd climbed to that position with nothing but his iron fists and the katana in his hand.
A man who had mastered all Three Types of Haki.
"Hic—!"
A loud belch echoed across the hall, drowning out all noise.
BOOM!!
A massive, spiked kanabo—Hassaikai—slammed into the floor, shaking all of Onigashima.
In an instant, the entire banquet hall fell into dead silence.
From atop his throne, a colossal figure stood—muscular like a war god, demonic in presence.
Kaido, Captain of the Beasts Pirates—the strongest creature in the world!
He raised his gigantic sake gourd, standing up with half-lidded, drunken eyes. His dragon-like face was twisted in madness.
"Listen well, all of you!!"
His thunderous voice rolled through the hall like lightning striking a mountain.
"Uwoooooo!!"
"Boss Kaido!!!"
The pirates' cheers erupted once more, shaking the dome.
— — —
Akira paused his movements, lifting his head slightly.
Behind those calm, lake-like eyes flickered a dim weariness that was hard to hide.
"…Again," he muttered softly.
"Kaido and his drunken madness."
"If only he'd act a little more rational and follow the expansion plans I prepared, the Beasts Pirates would've conquered far more than this tiny country called Wano."
"Now Monkey D. Luffy's already at sea… In two years, this place will be destroyed by him."
He let out a cold snort in his heart.
It had been eighteen years since Akira was thrown into this world.
Once, he'd been just an ordinary college student who knew every One Piece arc by heart.
Then, after an accident, he woke up in this world—an orphan bleeding out on a battlefield—only to be saved by Kaido, who happened to pass by.
For eighteen years, he walked the thin line between life and death, surviving in the living hell known as the Beasts Pirates, relying on sheer willpower that transcended human limits.
Without the power of a Devil Fruit, he had forged his body and Haki to the edge of perfection.
For years, he'd advised Kaido to expand—move toward the East Blue, crush Luffy and his crew before they could grow.
But Kaido and his men had no ambition.
They only knew how to drink and feast every single day in Wano.
Akira was getting sick of this life.
Rather than waiting two more years to be crushed by Luffy, he'd rather leave early—
and conquer the seas under his own name.
— — —
"Everyone! Today I have big news for all of you!!"
Kaido's booming voice tore through Akira's thoughts.
The dragon's eyes gleamed as they swept across the entire hall—past King the Wildfire in his mask, Queen the Plague with his massive frame, and Jack the Drought with his twin tusks—
until finally, they locked onto Akira.
"Akira!!"
The name thundered like a bolt of lightning.
The young man stood, lowering his head slightly in perfect respect.
"Yes, Boss."
Kaido grinned wide, baring sharp, steel-breaking teeth—
and let out a roaring, drunken laugh.
"Wororororo! Akira! You damn brat—you've been on my ship for eighteen years!"
"Your strength! Your loyalty! Your talent! I've seen it all with my own eyes!"
"Across the entire sea, you're the future star I trust the most!"
Kaido's booming praise sent shock rippling through the entire hall.
No one—absolutely no one—had ever heard Kaido praise a subordinate like that before.
But inside Akira's chest, alarm bells rang loud and clear.
Something was wrong.
Kaido wasn't the kind of man to hand out compliments for free.
And sure enough—the next words from the world's strongest creature shattered whatever calm Akira still had.
"I've decided!"
Kaido thrust a finger straight toward Akira, his gesture carrying the weight of divine decree.
"From this day forward—you'll marry Yamato!!"
Crash!
The sound of shattering cups and falling sake bowls filled the hall.
In an instant, the wild celebration froze into a silence more suffocating than death itself.
Every single eye turned toward Akira.
Shock. Envy. Confusion. Disbelief—countless emotions blended into one chaotic storm.
Kaido gazed at him in satisfaction, as though the "blessing" he had just announced were the most generous gift in the world. He took another gulp from his giant gourd, then added something even more explosive.
"Wororororo! Akira! From this day on, you're my personally chosen son-in-law!"
"And when the day comes that I die—"
Kaido raised his massive spiked kanabo, the head of the weapon pointing directly at Akira.
"You will inherit the title of Captain of the Beasts Pirates!"
Boom!
If the first declaration had stunned everyone, this one blew their minds apart.
King the Wildfire—usually as calm as a still lake—snapped his masked face toward Kaido for the first time, eyes trembling with disbelief.
Jack the Drought stood frozen, jaw practically on the floor, expression twisted with incomprehension.
A human… would become the next captain of the Beasts Pirates?
Then what about them—the All-Stars, the Three Calamities? What did that make of their positions?
He didn't even have a Zoan form! How could a man without a beast's shape ever lead the Beasts?
While the hall still reeled from Kaido's sudden announcement, Akira himself was struck speechless.
"Kaido's… son-in-law?"
"Marry Yamato?"
To marry that lunatic woman who called herself Kozuki Oden every day—
who had horns sprouting from her head and fought like a raging beast?
Yamato's image flashed through his mind.
There was no denying it—she was beautiful. But her wild, explosive temper was a nightmare all its own.
She shouted about opening the country and freedom, chasing empty ideals with no direction, and whenever she got emotional, she wanted to drag her own father down to hell with her!
And worst of all—she was too tall!
Even though Akira stood nearly two meters with a build of pure muscle, that monstrous woman still towered a few inches above him.
Definitely not his type.
Akira's ideal woman was more like Kozuki Hiyori—graceful, gentle, and elegant.
But now wasn't the time for preferences.
Kaido never acted without purpose. In an instant, Akira understood the true meaning behind his "decision."
Binding and control.
Kaido didn't trust him.
Perhaps he had already sensed Akira's growing intent to leave the Beasts Pirates and build a force of his own.
Or perhaps Kaido simply trusted no one who didn't share his blood.
So he used the oldest and most effective method known to mankind—
a political marriage.
He wanted to tie Akira down forever to the aging ship called the Beasts Pirates.
And that talk of "succession"?
Utter nonsense.
It was nothing more than a false promise to keep him loyal.
Even without Luffy, Kaido's immense longevity—granted by the Uo Uo no Mi, Model: Seiryu and his Oni heritage—meant Akira, a mere human, would die long before him.
And now that Luffy had already set sail…
Two years from now, the Straw Hat Pirates would come, defeat Kaido within an inch of his life, and shatter the Beasts Pirates to pieces.
When that time came—how could Akira possibly be "the next captain"?
No. Kaido wasn't looking for a successor.
He wanted an heir—
a child born from the combined power of himself and Yamato.
A true monster who would inherit the blood of the dragon.
And Akira… was just the tool to make it happen.
"Damn it…"
Akira's fists clenched tight beneath his sleeves.
If he truly became Kaido's son-in-law, every one of his plans would crumble to dust.
"I have to escape… before it's too late!"
His mind raced for a reason to refuse this insane proposal without provoking Kaido's wrath—
when suddenly, a mechanical voice he'd waited eighteen years to hear echoed in his head.
[Ding!]
Akira's pupils shrank sharply.
[Host detected: age 18 reached. System 'Strongest Pay-to-Win Across All Worlds' initializing!]
[Energy level 100%!]
[System successfully activated!]
A translucent blue panel appeared before his eyes, hovering like a hologram.
The design was simple—almost plain.
[Host: Akira]
[Weapon: Great Blade – Dragon Slayer]
[Items: None]
[Talents: None]
[Abilities: Three Types of Haki]
[Assets: 3,000,000,000 Berries]
…
And at the bottom-right corner, a gaudy golden button flashed obnoxiously before his eyes.
[First Top-Up Package!]
[Click to Purchase!]
Akira: "…"
It took him a full three seconds to process what had just happened.
Eighteen years.
He had waited eighteen whole years for this system!
He had survived from infancy to adulthood inside the Beasts Pirates, endured hellish training, bled and sweated to master all three forms of Haki—
He had nearly reached the peak with his own strength—
and only now, the damned system decided to show up?!
Inside, Akira couldn't hold back his curse.
"I'm about to become Kaido's son-in-law, and you—stupid system—you show up now?!"
[Ding!]
[Beginner Package unlocking automatically…]
The system's voice continued to echo in his head.
But in the real world, only a single second had passed.
And that single second was enough for Kaido—ever sharp despite his drunkenness—to sense the subtle shift in Akira's aura.
BOOM!
Kaido rose from his throne.
His colossal body loomed like a mountain, casting a shadow that swallowed Akira whole.
The stench of alcohol vanished, replaced by a killing intent so dense it felt tangible.
When Kaido spoke again, his tone was low and icy—without a trace of drunkenness.
"What's wrong, Akira?"
He leaned forward slightly, lowering his massive dragon-like face until his burning eyes were level with Akira's.
"Are you… rejecting my gift?"
"Or rather—" Kaido's eyes narrowed dangerously.
"Do you think… my daughter isn't good enough for you?"
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