One Piece: I will become stronger by checking in

Kai went all out right from the start. His main body unleashed 100% of his power, supported by three clones each at 90% strength.

There was no room to hold back—his opponents' lineup was far too overwhelming for him to take it slow.

Kai had yet to gauge the strength of the CP0 leader, but his instincts told him the leader was likely at the level of a Marine admiral. Alongside him were three more CP0 agents, each at least equivalent to high-ranking vice admirals.

Kai had to admit, the situation was tricky.

As for CP9, aside from Rob Lucci, who was somewhat capable, the rest were nothing but cannon fodder. They were weak enough to be crushed effortlessly.

Yet, despite the odds, Kai felt no fear. If anything, he was exhilarated.

His strength had skyrocketed over this period, and now he had the perfect opportunity to test it.

And losing? That wasn't even on the table. With his clones essentially on par with admiral-level power, the playing field was far from even—for his enemies.

The moment Kai's Conqueror's Haki erupted, everyone opposing him froze, their faces grim.

Garp broke the silence, speaking with a mix of awe and tension:

"What a terrifying ability… You can create three clones with almost the same power as yourself!" He smirked. "And kid, your Conqueror's Haki isn't half bad either."

Kai grinned darkly. "Save the compliments. I've always wondered about the strength of the Marine hero who gave Pirate King such hell. Today's my chance to find out."

Without warning, Kai and his three clones charged forward.

The real Kai barreled toward Garp, while his clones split up—one targeting the CP0 leader, another Aokiji, and the last taking on Kuma.

The battle erupted instantly.

BOOM!

A deafening explosion rattled the island. Even Luffy and his crew, who were trading their loot for gold nearby, heard the massive noise and felt the earth tremble.

As they stepped outside, they saw Marines evacuating civilians and locking down the area. The smiles quickly vanished from their faces as a bad feeling crept over them.

"That's the direction where Kai, Robin, and Chopper went," Luffy said, his voice tense.

Before they could react further, three figures emerged from an alley. Luffy recognized them instantly.

"Robin! Chopper! Sanji! Over here!"

Robin glanced up, her face pale with worry. "Luffy! Get to the Merry now! We need to leave the island!"

Nami furrowed her brow, sensing something was very wrong. "What's going on, Robin? Where's Kai?"

Robin didn't stop running. "No time to explain! We'll tell you everything on the way—just move!"

Understanding the urgency, the crew fell into step, racing toward the Merry.

Meanwhile, back at the ship, Zoro stood on the deck, eyeing the dozen Marine warships surrounding them. He tied his bandana around his head, his grip tightening on his swords.

"This isn't looking good," he muttered grimly.

CRASH!

A massive impact sent one figure hurtling through the air before slamming into the ground and skidding into the sea. The shockwave shattered the earth, leaving devastation in its wake.

Kai planted his weapon on the ground, standing tall amidst the destruction. He glanced toward the water where his opponent had landed and smirked.

"Is this the strength of the so-called Marine hero? If that's all you've got, this is gonna be a letdown."

Before his words even settled, a column of water erupted from the sea as Garp launched himself skyward using Moonwalk. He cracked his neck, his smile wild and unshaken.

"Kid, you're stronger than I thought!"

Even from their brief clash, Garp could tell that Kai's strength had reached the level of an emperor. Combined with his clones and their overwhelming power, Kai was practically untouchable. No wonder the World Government threw everything they had to capture him.

Still, Garp wasn't sure it would be enough. Looking around the battlefield, his suspicions grew stronger.

Aokiji? He was holding his own but just barely. Kuma? He was struggling, his ability the only thing keeping him afloat.

The CP0 leader? He was getting pummeled. Despite his strength and the backup from other agents, Kai's clone was absolutely thrashing him.

Garp clenched his fists. The only reason the clone wasn't overwhelming Aokiji and Kuma was because it seemed to be going easy on them—almost as if it were toying with them.

But the CP0? That clone wasn't holding back. It unleashed one devastating attack after another, pushing the leader to the brink.

It was almost comical. Why were some of Kai's clones going all out while others were practically slacking off? The uneven effort was enough to make anyone question reality.

Kai observed the chaos, a satisfied smirk on his face. "Not bad," he said to himself. "Not bad at all."

He could afford to praise himself—it was a well-earned victory in the making.

With his strength now fully at an emperor's level, Kai was a one-man wrecking crew. His clones, a nightmare for anyone who dared to challenge him, made him an unshakable force.

Shaking off his musings, Kai refocused on Garp.

"Let's see how much more you can take, Marine hero!"

Kai charged forward, swinging his kanabo with deadly force.

"Thunder Bagua!"

Garp didn't flinch. Laughing loudly, he coated his fist in Armament Haki and swung back.

The collision unleashed a shockwave so powerful that buildings crumbled and seawater rose like a tidal wave.

Kai felt the raw power of Garp's punch reverberate through his weapon, and for the first time, his smirk wavered slightly.

But it returned just as quickly.

"As expected of the Marine hero," Kai admitted, his tone laced with respect and a hint of challenge. "Your Haki's incredible!"

The battle raged on, shaking the island to its core.

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I take back what i said, bro is cooking them. They are the ones who need plot armour now.