One Piece: Start with Zanpakutō

[Hirenkyaku]

[Your comprehension is extraordinary. Through observing your own Haki and merging it with the Rokushiki, you have mastered this exclusive technique.]

[By perfectly fusing physical skill with Haki, using externalized Armament Haki as a stepping stone, you can fly freely through the air.]

… 

As the information flooded into his mind, Rosen's gaze turned deep and thoughtful.

Hirenkyaku.

With this new version of footwork, his speed was no longer a shortcoming.

Even if he faced a user of the More-More Fruit like Brynndi World, who could amplify his speed a hundredfold, he would no longer be at a disadvantage.

After all, the Hirenkyaku was never meant to stand alone.

"If I combine it with the Blut Arterie, my speed will climb to a whole new level."

A bright glint flashed across Rosen's eyes.

The instant he created the Hirenkyaku, he had already envisioned how to integrate it with every technique he had developed thus far — all the martial paths he had carved.

The Blut Arterie could push both attack power and speed to the extreme.

Combine that with Hirenkyaku.

In terms of pure speed, Rosen now dared to say he feared no one.

Except, of course, the Pika Pika no mi.

After all, that was light-speed — and no matter how confident he was, even he wouldn't dare claim to outrun light after merely three days of training.

"If I fought Brynndi World again… or if I faced him in his prime, before he was frozen… with Hirenkyaku, could I end him in an instant?"

Rosen replayed that earlier battle in Infinite Hell, then quietly shook his head.

"I can win. But not instantly kill."

"If he had been in an open battlefield instead of the enclosed hell, with his hundredfold power boost, even with his mediocre Observation Haki, he could still evade most strikes with ease."

"And if he decided to flee instead of fight to the death? I couldn't stop him, especially not in the vastness of the sea."

Rosen knew perfectly well — the Infinite Hell had confined World, stripped him of weapons, and limited the power of his fruit.

If it had been a naval battle instead… and if World had wielded swords, pistols, cannons — the World Destroyer's strength would have surged by several levels.

Defeating him would have been a completely different challenge.

… 

Snap!

As Rosen pondered, a soft knock came at the door. Domino's voice followed.

"Mr. Zephyr."

"Vice Admiral Kizaru."

"Mr. Rosen."

"Lunch is ready. Would you like to eat now?"

Domino stood outside, awaiting orders.

"So fast?"

Hearing this, Rosen paused mid-thought.

He did feel a hint of hunger.

From the moment they departed Marine Headquarters to arriving at Impel Down… all the way down to the sixth level… Forging two new Zanpakutō on the way… fighting Brynndi World without pause… and finally creating Hirenkyaku.

He had truly rushed forward nonstop, never sparing even a breath.

"This is the Burning Hell," Zephyr explained with a faint smile. "If there's one thing we have in excess, it's the means to cook."

Turning his head, he barked, "Bring it in."

Seeing Rosen's distracted expression, he understood. A quiet, comfortable space was the best soil for his student's growth.

"Yes!"

The door opened, and staff carried in plate after plate — giant hunks of Sea King meat and rich staples, all steaming hot.

This office had long been prepared by Magellan as a special reception room. Spacious enough that even after piling up hundreds of kilograms of food, it still felt open.

"Thank you for your hard work."

"Miss Domino."

"If I don't call for you, please make sure no one disturbs us again."

Zephyr's tone was calm, yet edged with authority.

"Yes."

"I understand."

Domino straightened, gave a crisp salute, then carefully closed the door behind her.

"Eat."

Zephyr nodded toward Rosen.

"Senior, come on!"

Rosen echoed back, motioning to Borsalino, before immediately tearing into a massive slab of roasted Sea King meat. His movements were smooth and unhurried, yet each bite carried a sort of fierce momentum.

He wasn't afraid of poison or any other hidden schemes.

The digestive system forged through the Rokugan Rebirth (Six-Organ Rebirth) could absorb even the deadliest poisons, transforming them into pure nourishment.

For others, eating was mere enjoyment or replenishing lost energy.

For Rosen, however, each meal was part of his practice.

The Haki Seed Refines through Haki Core fortified his Three Forms of Haki.

The perfect digestive system refined through Rokugan Rebirth (Six-Organ Rebirth) reinforced his body while fueling the growth of his Haki.

All this demanded immense nutrition.

Thus, Rosen hadn't been the slightest bit upset by Domino interrupting his earlier train of thought.

A single meal.

Then he would resume his contemplation — inspiration flowed through him like a river; it would never run dry.

Indeed, after that exchange with Zephyr, Rosen had already planned his future training schedule.

Before leaving Impel Down…

Morning: practice.

Midday: physical Training.

Afternoon: create new techniques.

A flawless trinity.

… 

[Your comprehension is extraordinary. Through consuming vast amounts, digesting them via the Rokugan Rebirth (Six-Organ Rebirth), and cultivating with Haki Core, your Three Forms of Haki and physical strength improve rapidly.]

[Armament Haki strength increased by 20%.]

[Observation Haki strength increased by 15%.]

[Conqueror's Haki strength increased by 13%.]

[Physical strength increased by 30%.]

… 

This time, Rosen didn't devour his food with wolfish haste. Instead, he ate in a measured, deliberate rhythm. Even so, the digestive power of the Rokugan Rebirth (Six-Organ Rebirth) was monstrous.

No matter what he swallowed, it dissolved within seconds — transformed into Haki energy, converted into raw bodily strength, then seamlessly integrated.

At the same time, the Haki Seed in his body Refines via Haki Core was also evolving madly.

Two forces working in perfect harmony.

The result was not simply one plus one — but far greater.

By the time lunch ended…

Rosen's Three Forms of Haki and his body had both stepped up to yet another level.

… 

"Still pondering your speed?"

After the meal, Zephyr asked softly. Borsalino had gone to boil water and prepare tea, leaving the teacher alone with Rosen.

"No."

"Before lunch, speed was indeed my greatest weakness."

Rosen shook his head, and without any attempt to hide it from Borsalino, he openly spoke of the Hirenkyaku he had just comprehended.

Since Zephyr had chosen to allow Borsalino to accompany them, it meant there was no need for secrecy — at least not regarding Hirenkyaku.

"In the time it took Domino to cook…"

"You managed to invent Hirenkyaku?"

Zephyr shook his head, sighing, but his eyes revealed no surprise.

No wonder.

Compared to the shocking techniques Rosen had created before — the Blut Vene, Blut Arterie, Haki Core, Rokugan Rebirth (Six-Organ Rebirth) — the Hirenkyaku no longer even registered as surprising.

"Hirenkyaku?"

"The stronger the Haki, the faster the speed… even capable of flight… and it can be merged with the Blut Arterie…"

"Junior brother… your comprehension is truly monstrous."

Borsalino slowly removed his sunglasses, and though his voice remained as lazy as ever, a subtle glow of admiration flickered in his eyes.

"Teacher Zephyr, I must admit… you were right."

"My own Hirenkyaku can't even compare to this."

"This uncut jade… only he can polish himself!"

Even Borsalino, who had long harbored grievances against Zephyr, was forced to bow his head at this moment.

Looking around the entire Marine Headquarters…

No one else could carve Rosen into perfection.

Only Rosen himself could refine Rosen.

Otherwise — even the most flawless jade would be left with hidden cracks.

...

If you enjoyed this book, don't forget to vote with a Power Stone and take a few seconds to leave a review

Join my P@treon for advance chapters and special content!

[email protected]/Ren_Saga