One Piece: With Sign-in System

Just as Diamante, wielding his rapier, was about to give chase, an overwhelming aura descended upon him. The force locked onto him so tightly that even his hand holding the sword trembled slightly. A bead of cold sweat involuntarily slid down his forehead.

"D-Damn it!"

"Your opponent is me." The black-haired young man, eyes still closed, smiled faintly at them. "Today marks the downfall of the Donquixote Family."

"Don't get ahead of yourself, you bastard!"

A burly man with a shrill voice, Pica, melded into the ground using his Devil Fruit ability, launching an attack on Ron. Spikes of stone erupted from beneath Ron's feet, aiming to skewer him.

But with a flash of movement, Ron vanished.

"W-Where is he?!"

Trebol frantically scanned his surroundings.

Senor Pink's voice trembled as he shouted, "Diamante, in front of you—"

Before he could finish, Diamante, already using his Observation Haki, sensed the intense danger. His eyes widened as he saw the black-haired young man step directly in front of him, blade descending in a swift arc.

"This attack... How could it possibly—"

Before Diamante could finish his thought, as he lifted his rapier to counter, a sudden chill enveloped his neck. He glanced downward and saw countless crimson droplets of blood floating upwards in the sunlight, shimmering brilliantly.

His pupils shrank.

"T-That's... my blood?"

"How could this be... When did he... He hadn't even drawn his blade..."

"How... did I die?"

One of the top executives of the Donquixote Family, Diamante, fell with his final question unanswered, his consciousness fading into oblivion.

Pica, Trebol, Senior Pink, and the other executives stood frozen, staring at Diamante, who collapsed to his knees, blood spraying from his neck. Standing behind him was the black-haired young man, his face calm and unreadable.

"Diamante... is dead?!"

"Why?"

"What just happened?"

From their perspective, all they saw was the black-haired youth with closed eyes appear in front of Diamante, blade in hand. As he stepped past Diamante, his blade flashed.

Diamante hadn't even managed to retaliate. He had barely raised his rapier, yet he seemed to move several beats slower than the youth.

It was utterly incomprehensible!

As Diamante's body fell, Ron softly uttered the name of his mist technique.

"Mist Breathing, Seventh Form: Obscuring Clouds."

The swordsmanship was like mist—ethereal, illusory, and unpredictable.

Under the influence of this strike, the boundaries between speed and stillness blurred.

Although the slash was executed at lightning speed, to the one being cut, it appeared unbearably slow.

Ron's expression remained indifferent as he casually swung the bloodied black blade in his hand. The blood was flung off in a single motion, revealing the blade's cold, gleaming sharpness.

"Tempest Kick!"

Ain, seeing both Zephyr and Ron engage in battle, didn't wait any longer. She unleashed a Tempest Kick at Trebol, sending a sharp blade of wind slicing toward him.

"Not on my watch!"

Noticing the incoming attack, Senor Pink stomped his foot and charged forward. His fist, hardened with Armament Haki, smashed into the azure wind blade, shattering it with brute force.

With every move, the tide of battle shifted, leaving the remaining Donquixote Family members in shock and terror. The air was charged with tension, and the black-haired youth's calm demeanor made him seem all the more invincible.

Ain's figure flickered as she used Shave to appear in front of Senor Pink, her sword wrapped in Armament Haki slicing down with immense force.

Senor Pink crossed his arms to block the strike, his limbs reinforced with Armament Haki. However, the power behind Ain's sword was too overwhelming, sending him flying backward. Just as he was about to crash into a building, he activated his Devil Fruit ability, merging into the building's liquid-like structure to avoid the impact.

Ain's sharp eyes narrowed as she expanded her Observation Haki, scanning for his next move.

…

Elsewhere, Trebol, Pica, and the remaining combat-ready Donquixote Family executives launched a coordinated assault on the black-haired youth standing calmly in the middle of the street. A barrage of unique abilities rained down on Ron. Yet no matter how relentless the attacks were, they couldn't even graze him—not even the hem of his cloak.

Ron's second strike of the day was swift and decisive. With a single swing of his blade, he cleaved Gladius, the Pom-Pom Fruit user, in two. The crescent-shaped arc of pitch-black sword energy tore through his body like a hot knife through butter, leaving a diagonal slash that split him cleanly apart.

The third strike followed.

In one motion, the weight-enhancing duo, Machvise and Dellinger, were dispatched, their fates sealed by the dark blade's unparalleled sharpness.

The fourth strike brought Trebol's demise. A ferocious flying slash severed his head from his body, ending his sticky schemes in an instant.

"D-Damn it!!!"

Consumed by a mix of rage and fear as his comrades fell one after another, Pica pushed his Devil Fruit power to its limits. He transformed into an enormous rock giant, towering over 900 meters tall. His massive form was so gargantuan that a single hand was the size of an entire village, casting a shadow that blotted out the sun.

Far away in the flower fields, Rebecca, who was training with the one-legged toy soldier in swordsmanship and combat, froze in shock as she stared at the colossal figure standing in the middle of the town.

"T-That... what is that?!"

"That's Pica, one of the top executives of the Donquixote Family," the toy soldier, once Kyros, said gravely. "What on earth is happening today? First, the King's Plateau was destroyed, and now Pica has been forced into such a desperate state."

His tone grew even more somber. "What in the world is happening in Dressrosa?!"

…

Back in town, the giant rock hand descended, aiming to crush Ron beneath its massive weight.

Standing mid-air with his black blade in hand and his eyes still closed, Ron let out a light chuckle. "Big, sure. But it's still useless. If you're going to use something that size to smash me, it's... a little too small."

He swung his black blade, infused with Armament Haki.

It wasn't a named technique, just a pure slash powered by a grandmaster's strength and Haki.

A crescent of black sword energy, spanning several kilometers, sliced through the rock giant cleanly, splitting it in two from the middle.

"Wha—?!"

Rebecca and the toy soldier, witnessing this from afar, were utterly stunned, their eyes nearly bulging out of their sockets. Their jaws practically hit the ground.

Ron wasn't done. With a horizontal slash, another black arc tore through the air, flying over the flower fields.

The colossal rock body was quartered—its halves becoming four.

Then another slash. Four became eight.

Ron continued his relentless onslaught. A single slash turned into eight, intersecting and dividing the once-massive rock body into countless fragments.

Rebecca and the toy soldier could only stand frozen, their minds struggling to comprehend what they were seeing.

Black arcs of sword energy, each spanning thousands of meters, shot out from the town's center, scattering in all directions and carving through the sky.

Rebecca's hands trembled as she stared at the spectacle, her voice filled with disbelief.

"T-This... this... is this swordsmanship?!"

Her eyes were glued to the black arcs tearing through the heavens, a mixture of awe and reverence overwhelming her.

The toy soldier, however, cared less about the terrifying slashes themselves and more about the person wielding such destructive power. Who could be fighting Pica and the Donquixote Family with such ferocity?

Under Ron's relentless barrage of sword strikes, Pica was completely consumed by fear. His body trembled as he lost all will to resist.

This wasn't even close to being a fair fight.

Whether it was Haki or sheer power, that monster outclassed him in every conceivable way.

If this continued, Pica knew he'd be cut down like the others—bisected and left lifeless.

"If... if I can just reach the ground... If I can just get there... If I can just escape to that place..."

Cowering in a chunk of floating rock, Pica clung to a desperate hope of retreating to the safety of the ground and fleeing far away from this horrifying man.

But to his despair, every piece of rock Ron had shattered was still floating high in the air, completely defying gravity. None of it showed any sign of falling—except for the piece Pica hid inside.

"Found you."

Ron swung his blade downward.

Pica, hiding in his tiny rock shelter, saw the incoming slash and realized there was no escape. He could no longer use his Devil Fruit ability to dodge. His only option was to harden his entire body with Armament Haki and take the attack head-on.

And then...

The blade cleaved through him effortlessly, slicing him in half at the waist.

…

Sugar, who had just regained consciousness, opened her eyes groggily. The first thing she saw was the massive floating chunks of rock in the sky and Pica's bloodied, bisected corpse falling toward the ground.

"Wha—?!!!"

Her eyes nearly popped out of their sockets in terror.

Letting out a piercing scream, her face went pale, and she fainted once again, this time from sheer fright.

The immense emotional shock broke the spell of her Hobby-Hobby Fruit.

All across Dressrosa, countless toys reverted to their original human forms.

Nearby, Rebecca's one-legged toy soldier also transformed—returning to his true self, her father, Kyros. A flood of memories rushed through Rebecca's mind in an instant.

"F-Father..."

Tears welled up in her eyes as she stared at him, her voice trembling with joy.

"Rebecca!"

Kyros, now back in his human body, was equally overwhelmed with emotion.

For years, darkness had shrouded Dressrosa. But on this seemingly ordinary day, with the arrival of just three people, dawn had finally broken.

…

Ain, without hesitation, slashed through Senor Pink's arms with a single strike. Following up with a ruthless Tempest Kick, she sent a sharp wind blade slicing across his neck.

Senior Pink's headless body collapsed to the ground, marking yet another fallen executive. The Donquixote Family's core members were now nearly wiped out.

In the sky, the massive chunks of rock floated motionlessly under Ron's control. With a wave of his hand, they converged toward a single location, forming a towering mound.

After finishing this task, Ron descended gracefully to Ain's side.

"Let's go. The old man Zephyr should be finishing up soon."

Ain nodded silently, and the two headed toward the outskirts of the city.

…

At the outskirts of Dressrosa, beneath the hill of the flower fields, a figure flew like a cannonball, crashing into the mountainside at tremendous speed.

Boom!

The impact caused countless cracks to spread across the mountain face, which then collapsed entirely.

The entire hill, along with the flower fields above and the artificial Devil Fruit factory below, trembled violently.

"What's happening?!"

Kyros and Rebecca, their reunion interrupted, turned their attention to the flower fields' base, anxiety etched on their faces.

At the foot of the hill stood Zephyr, exuding an aura of dominance and bloodlust. He stared coldly at the pile of rubble before him.

"What's wrong, Doflamingo? Is this all you've got?"

"Without your dirty tricks, is this the limit of your strength?"

From within the rubble, Doflamingo's sinister laugh rang out, full of rage and mockery.

"Hahahaha! A Seastone weapon specifically designed to counter Devil Fruit users? I'll admit—it's far more effective than Haki."

Doflamingo's bloodied figure emerged, wearing his iconic pink feathered coat. Despite the injuries on his face and body, his eyes burned with fury.

"But Zephyr, you're no longer the Black Arm Admiral of your prime. And I... am not the man I was back then. Do you really think that toy will be enough to kill me?"

As his words echoed, the rubble, the ground, and even the mountain wall behind him transformed into countless white threads that spread outward, engulfing the area.

Standing amidst this white-threaded world, Doflamingo looked like a ruler commanding his domain, his aura both tyrannical and unyielding.

Zephyr's eyes narrowed. "Devil Fruit awakening... So, this is your trump card."

"Hahaha!" Doflamingo grinned maniacally. "Let's finish this, Zephyr. Today, it's either you or me!"

Zephyr smirked. "Perfect. That's just how I like it."

Swish!

Both figures vanished simultaneously.

"Surge White Wave!"

"Smash Fist!"

Zephyr's Haki-hardened fist collided with Doflamingo's massive, blackened wave of threads.

The resulting shockwave was cataclysmic. The earth itself was torn apart, and fierce winds blew away distant buildings. For miles around, every piece of glass shattered, and the ground trembled violently as the two titans clashed.

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