Idle Level-Up in One Piece Chapter 186 - 186 – Fistbone: Honesty. Haki Is the Peak of Power!

Drive the pressure to its utmost limit. When backed into a corner, you'll unleash it all—even Devil Fruits, beyond just swordsmanship.

"Mad Thunder – Bull Rush!!"

Rampaging Bear's expression soured as he unleashed a more savage onslaught, bellowing in scorching rage:

"Yaaaargh! This is pissing me off! Muscles are the apex of this sea!"

"The power of muscles is the peak!"

In that very moment—

His aura grew savagely wilder and more beastly, ferocious power flooding into his blow.

Strength erupted without delay.

The atmosphere quaked fiercely, resembling churning, heated liquid.

"Fistbone: Honesty!"

Klein's demeanor transformed sharply, embodying the relentless resolve to pulverize all with his fists—driven by an urge to safeguard.

To shield his crewmates?

No—

To be precise, to guard Gloriosa and Shakky, ladies deserving the title of true gems.

Klein quietly altered the fundamental intent of Fistbone: Honesty.

After all…

Deep down, he couldn't accept that "Deserter King" Koby drivel at all.

"Muscles are the peak?" Klein shot back during his swing.

"No. Haki is the power that reigns above all else!!"

Crackle—Zzzzzzt—

With his fist clad in Conqueror's Haki thrusting ahead, black-red lightning exploded chaotically, ripping across the heavens!

BOOOOM!

Blending monstrous might with prodigious skill, Klein refined his force perfectly, rendering this blow mightier and more ruthless than ever!

It exuded an invincible presence.

Three years of pay-to-win grind exploded in this strike loaded with actual riches.

Yes—real worth.

Before the fist connected—

The Conqueror's Infusion, brimming with detonative domineering force, collided with Rampaging Bear's fist in midair.

At the instant of impact, shock burst in Rampaging Bear's eyes as shudders coursed through his body:

"This brat—his attack power skyrocketed!?"

"The boost from Conqueror's Infusion is just… insane!"

His Armament Haki got devoured, eroded by Klein's dominant pressure.

Damn it!

His Armament Haki crumbled quicker than anticipated—"This punch… I can't stop it!"

The idea had scarcely arisen when he got hurled kilometers distant like a stone skimming water, crashing repeatedly into the island.

Every collision erupted massive smoke plumes skyward.

"I was just planning to make a token appearance… but now I'm fired up. No way I'm going to leave this half-baked."

Klein glided over the terrain like a soaring craft, speeding into the island's depths.

On the Titanic.

Upon hearing those words, Gloriosa's slender body quivered uncontrollably, a raw bodily response flooding her.

It felt as if every ounce of her vigor vanished instantly.

Her affection for Klein transcended mere sentiment—it had become visceral.

Humans, be they men or women, all feel desire. It's innate.

"Klein-sama… You can drive through any damn drainage ditch, huh? I'm impressed!"

Os gaped in total shock.

'Driving'—a phrase he'd picked up straight from Klein.

Charlotte Linlin's features hardened, irritation plain on her face.

"Hmph. When's Klein finally going to marry me—?"

"It's been three years already."

"Don't tell me I have to wait another three years!?"

Over the years, she'd suggested marriage multiple times, yet Klein turned her down each time.

First off, Linlin remained too youthful—

Not yet 14.

Secondly, she hadn't finished his training regimen.

But above all… their physiques mismatched badly. Their '10-style' gear simply didn't align—yet.

"Oi, Linlin, you'd better focus on Oyaji's 'Iron Fist.' It's rare to see him use one of this magnitude—you don't wanna miss it," Loki suggested softly nearby.

Thanks to Klein's guidance, Linlin built a solid base. He trained her in Iron Fist.

Still, her determination lacked real intensity.

Her aptitude overwhelmed everything.

The tiniest exertion elevated her way above ordinary folk—offering scant trial or strain.

Loki continued, "Oyaji's Iron Fist is easily a hundred times stronger than yours..."

"I know, I know! Oyaji said it himself: Haki is the power that reigns above all else!"

Excitement brightened Kaido's young face.

At just 3 years old with no formal training begun, he mostly shadowed Klein or observed battles among Loki, Linlin, Newgate, and Gloriosa.

Every word from Klein stuck in his mind—sharp and unforgettable.

Yet Kaido remained unaware…

That cherished phrase originated from his own future self.

Kaido faced Os.

"Os! Quick, gimme the binoculars! They've moved deeper into the island!"

"Here." Os removed the binoculars from his belt. True, his sniper rifle Qianlu featured a scope—but that weapon was a holy present from Klein-sama.

He wouldn't handle it casually. It was his treasured Black Sniper Rifle.

Elsewhere.

"Mr. Lincoln—he's completely getting overwhelmed by Klein. He's way too strong."

Admiration and jealousy filled Kong's gaze. As a Marine, who wouldn't aspire to Admiral rank?

From Klein's display now, his chances of achieving it…

Stood at 100%.

Considering Klein's youth, he'd claim the title of youngest Marine Admiral ever—sparking envy across the ranks.

Solemnity settled on Kong's face.

"I once hoped Klein would be my adjutant. But at this rate, when he becomes an Admiral…"

"You just keep at it, Kong. If you push hard enough, you might be an Admiral in a few years too."

Instructor Carter offered a reassuring shoulder tap.

He understood the sting of trailing an uncatchable rival.

Particularly when…

Klein, that freak, shone as the era's top prodigy!

"That little freak's growth rate is absolutely absurd. Just absurd!"

Carter echoed Kong's thoughts aloud, then sighed:

"But looking at it another way—it's actually a huge blessing."

"If you make it too, we'll have all three Admirals set. Add in the next gen—Sengoku, Garp, and the rest—and the Marines will enter their golden age."

"A golden era for the Marines—!"

Oharden nodded firmly.

"Carter's right. And don't forget—Klein's adopted son isn't just any brat. If he manages to pull in the Giants..."

"That'd be an incredible force."

A slight frown creased his brow, concern glinting in his eyes.

The World Government likely wouldn't welcome Marines gaining such might.

He sighed to himself:

"One step at a time. Once I retire, the Navy won't be my problem anymore."