The Strongest Lunarian in One Piece

"Clang, clang…"

Vodka Kingdom

Inside the spacious royal palace, heavily armed Marines held thick iron chains, tightly restraining a tall, rugged yet youthful-looking boy. Their expressions were tense, allowing no room for carelessness.

"Hey, hey, what are you doing?"

The boy—his hands bound and horns protruding from his head—frowned slightly. Though he wasn't struggling, he glanced at the Marines surrounding him before looking up at the king seated on the throne. His tone remained calm:

"Your Majesty, I don't recall committing any crime."

The king gazed down at the towering youth, a mix of regret and resolve in his eyes.

"Kaido, you should join the Marines."

The king's voice was firm despite the obvious reluctance.

"This nation is too small to contain someone like you. Keeping you here is a luxury we cannot afford."

"That's right," a Marine Rear Admiral said, stepping forward and handing a document from the World Government to one of the kingdom's officials.

"As long as you hand over Kaido, this nation will be granted the right to participate in the next World Summit."

Of course, participation wasn't the only incentive; the kingdom feared offending the World Government, well aware of the disasters that could follow.

Kaido raised an eyebrow, his tone laced with sarcasm.

"So, I'm just a political pawn, huh?"

Yet, he didn't seem angry. Glancing down at the chains binding him, he said with a hint of amusement, "Was it really necessary to tie me up like this?"

Turning to the Rear Admiral, he asked bluntly:

"Is this how the Marines treat their 'comrades'?"

Just as a certain "someone" had once told him, Kaido realized that in the eyes of kings and rulers, soldiers were mere tools. And indeed, his exceptional performance had attracted the World Government's attention sooner than expected.

The Rear Admiral coughed awkwardly.

"Apologies… it's just a precaution to prevent you from resisting."

He had heard the rumors about this boy: though under ten years old, Kaido was already the strongest warrior in the Vodka Kingdom. Not only had he naturally awakened Observation Haki, his physical strength was monstrous—far beyond what should be possible at his age.

Kaido's expression remained calm.

"Fine. Then let me go."

His tone carried an air of confidence as he continued, "Joining the Marines means I can get stronger, right? That sounds great. I've been bored out of my mind in this dull country anyway."

He smirked.

"Now untie me. Otherwise, when I become an Admiral, I'll make sure you lot clean toilets every day!"

"Hey, kid, don't get cocky!" one of the Marines retorted. "Becoming an Admiral isn't as easy as you think. Admirals are the highest combat force of Marine Headquarters—true 'monsters'!"

The other Marines nodded, clearly annoyed at Kaido's overconfidence.

"Is that so?" Kaido sneered, his muscles tensing as veins bulged across his arms.

"CLANG! CLANG!"

With a sudden surge of power, he snapped the thick iron chains.

"What?!"

"He broke the chains?!"

"This… this monster!"

The Marines stared in shock, unable to believe what they were seeing. As the broken chains clattered to the floor, Kaido looked up at the panicked king, who seemed terrified that Kaido might retaliate. Then, turning his gaze to the equally stunned Rear Admiral and the sweating Marines, he began walking toward the exit.

"Let's go, Marines… I've had enough of this place."

For years, Kaido had remembered the lessons taught to him by a certain someone. While honing his body and mastering Observation Haki, he had deliberately hidden his full capabilities to avoid undue attention. If he wished, none of these Marines would stand a chance against him.

…

Three Days Later, Marineford

A Marine warship approached the colossal Marine headquarters.

"Boom, boom…"

In the distance, the towering fortress came into view.

"Kaido, get ready. We're almost there," the Rear Admiral called out to the horned boy, who was drenched in sweat after an intense training session.

Over the past three days, the Marines had come to understand the true meaning of "monster." Kaido's insatiable appetite required numerous resupplies, and his training methods were extreme beyond belief. Blindfolded, he had even ordered the Marines to shoot at him—allegedly to sharpen his Observation Haki. Yet, even when bullets found their mark, his body showed no signs of injury, a testament to his incredible resilience.

"Almost there?" Kaido wiped his brow, eyeing the massive fortress ahead. "So this is Marine Headquarters?"

His sharp gaze caught sight of something unusual along the distant shore. Broken warships were piled together, and loud crashing sounds echoed across the docks. Squinting, he saw figures in training, their fists relentlessly pounding the vessels.

"Those are decommissioned warships," the Rear Admiral explained.

"The man over there is Vice Admiral Garp, known as the 'Iron Fist.' He uses warships as punching bags, refusing to use Haki. It's his way of forging unparalleled strength."

The Rear Admiral spoke with admiration. He had tried Garp's training regimen himself but couldn't handle it. Without Haki, his fists ended up bloodied, leaving him incapacitated for days.

"Garp's relentlessness has given him iron fists that terrify pirates everywhere."

"Tch…" Kaido clicked his tongue, unimpressed. "Warships as punching bags? That's boring."

He recalled a different scene: a certain "someone" training with pure seastone weights, using the Red Line itself as a punching bag. Compared to that, warship training seemed like child's play.

"You brat!"

Several Marines scowled at Kaido's dismissive tone. To them, Garp was a hero—humble, kind, and immensely powerful. Hearing Kaido mock him so openly made their blood boil.

~~~

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