One Piece: Start with Zanpakutō

"Of course."

"If I hadn't mastered the Hardening, how could I dare to say that I would continue to be your classmate of Rosen from tomorrow."

Gion's words revealed a sense of awe-inspiring confidence, but at the same time, reason told her that she was making progress while Rosen must be standing still.

After all, the man in front of her mastered the Armament Haki's Hardening in just half an hour.

And the Haki aura that swept across the entire naval academy was the best proof.

"That's right."

"You just said that there won't be a second time like today when you can't control your Conqueror Haki so finely."

"Have you already practiced Conqueror Haki to the intermediate level?"

Gion keenly captured an extremely shocking amount of information from Rosen's mumbling.

"It was just a fluke."

Rosen smiled modestly.

"How can there be any luck in this kind of thing?"

"Conqueror's Haki is the most difficult to control among the three Forms of Haki."

"Without a year or two of training, an ordinary king simply cannot control it with ease."

When Gion looked at Rosen, a complex look flashed across her beautiful eyes.

She came out of the dormitory tonight, one to admire the cherry blossoms, and the other to relax her tense spirit from practicing Armament Haki all day.

Unexpectedly, she saw Rosen in the corridor.

She originally wanted to regain some confidence from the other person, but she was hit hard again.

She thought she had caught up with Rosen and was not inferior to him, but the fact was that she could only barely see the man's back.

"I have classes tomorrow."

"I think you do too."

"Let's stop here for tonight, Gion-san."

Rosen glanced at the night sky and didn't dwell on the topic of Haki.

After saying goodbye to Gion, he turned and walked back to his own room.

This is also one of the treatments for students in the Zephyr class.

No need to share a dormitory with other people.

"Rosen."

Gion quietly looked at Rosen's back until he walked back to his room and closed the door of the dormitory. Then she withdrew her gaze and looked at the cherry tree downstairs.

At this moment, her eyes flickered, and her chest, which looked down upon all the women in the department, rose and fell slightly. Her mind was filled with things and emotions related to Rosen.

The original idea of viewing the cherry blossoms had long gone.

… 

The next day.

Rosen got up early and arrived at the class place where he had agreed to meet Zephyr on time.

The cracked square that was used by the Sengoku to demonstrate the Conqueror's Haki yesterday had been restored to its original state after a night of repairs.

But just as he arrived at the class, a capybara face appeared almost in front of him.

"Hey! See you again, Brother Rosen."

"It's true that we meet everywhere in life!"

"I didn't expect that we could continue to be classmates today even though we just separated yesterday."

Tokikake put his face in front of Rosen, and his smug capybara face was almost written with the words "I have mastered the Armament Haki Hardening."

"You seem very happy!"

"Well then, Tokikake."

"You must cherish it. After all, your relationship as classmates can only last until the end of this class."

Before Rosen could say anything, Zephyr's tower-like figure had already stood behind Tokikake.

"Teacher Zephyr."

"I don't quite understand what you mean?"

Tokikake's smile froze.

"Fool."

"Have you forgotten yesterday's Conqueror's Haki?"

"Rosen, he has already trained his Conqueror's Haki to the intermediate level."

Not only Tokikake came today, but also Gion, who also spent a day training in Armament Haki.

"It's nothing."

"Anyway, I don't have Conqueror's Haki, which means I'm not behind Rosen."

"Teacher Zephyr, what are the three of us going to practice today? Is it the flow of Armament Haki? Or Observation Haki?"

Tokikake is very good at comforting himself.

Without the Conqueror's Haki, it means you have fallen behind.

"Today's lesson is not about learning the techniques of Haki, but about learning how to increase the strength of Haki."

When Zephyr said this, Rosen also pricked up his ears.

He has learned all the techniques of three Haki.

What is lacking now is nothing more than the Haki strength.

Once the strength of his Haki aura catches up with his skills, and he practices his physical skills and swordsmanship, even without the weapon fruit, he will definitely be an emperor.

"Remember, the technique of Haki power is acquired through practice, and the strength of Haki power is acquired through fighting."

"So, if you want to increase the strength of your Haki aura, just one word."

"Beat."

Zephyr looked around at Rosen and the other two, his tone extremely serious:

"Only by constantly fighting and using Haki can the strength of Haki be continuously increased."

"Especially when it reaches a certain intensity."

"Only when you are at the limit of actual combat can you reach a higher level."

Hearing Zephyr's words, Rosen frowned slightly.

He was not questioning Zephyr's teaching level. On the contrary, he was very clear that what Zephyr said was absolutely right.

Skills are acquired through practice, and strength is gained through fighting.

Whether it is the mediocre teacher Rayleigh or the famous teacher Kaido, they all use this method to train Luffy.

Only.

"Relying solely on continuous fighting to increase the strength of Haki is risky and slow to produce results."

"King Luffy fought Rayleigh for two years on Rusukaina Island. After entering the New World, he fought against the Fishman, Doflamingo, Big Mom, Katakuri... all the way to Wano Country, until he defeated Kaido on Onigashima."

"Even though sparks and lightning are on fire, the strength of their Haki aura is still not as strong as that of the veteran Emperor. They can only rely on the Nika form combined with the three Haki aura to compete with the Emperor."

Rosen thought of Luffy's journey of cheating, in which he frequently spent his life, but his Haki power was still not as good as that of the Emperor. He shook his head secretly:

"Teacher Zephyr said that skills are acquired through practice, and strength is gained through fighting."

"Then can I fight and practice at the same time?"

"One practice and one fight, one still and one moving, two-pronged approach, the efficiency of increasing the strength of Haki power is absolutely maximized."

"However, the prerequisite is to develop a training method suitable for increasing the strength of Haki power."

Rosen's brain was racing, but his consciousness was infused with the three Haki aura.

He was doing two things at once, thinking about how to increase the strength of his Haki aura through practice, while carefully comprehending the essence of the three Haki aura.

Gradually.

The mind is completely immersed in the ocean of Haki power, and countless spiritual lights burst out.

"Little brother."

"Don't be distracted in class."

"Teacher Zephyr is famous for being strict."

Tokikake, who was standing next to Rosen, noticed that the other party was distracted, so he lowered his voice and tried to remind Rosen, but there was no response.

Seeing this, he was about to hit Rosen with his elbow, but was stopped by Zephyr.

"Don't call him."

Zephyr stretched out one hand and locked Tokikake's elbow like lightning, preventing him from touching Rosen.

"I don't even wait to be scolded for being distracted, and I don't want anyone to disturb me."

"Monsters are good!"

"Even Mr. Zephyr, who is known for his strictness, is so lenient with him."

Tokikake sighed inwardly.

However,

He had no idea that Zephyr's heart was already filled with turmoil.

"That's it."

"He was like this in the Power Testing Room yesterday, and then he realized the fifth Armament Haki technique, the Blut Vene."

"Could it be that he is going to realize something again?"

Zephyr raised his hand, signaling Gion and Tokikake to keep quiet.

Seeing his serious expression, Tokikake realized that he must have misunderstood Zephyr.

This wise teacher, who was known for his strictness, did not tolerate Rosen indiscriminately, but something happened that was beyond his understanding.

[Your understanding is extraordinary. With the ultimate power of Haki as the foundation, you visualize the essence of Haki, and combined with Zephyr's explanation, you successfully deduce the method of Training Haki: the origin of Haki core.]

[Origin of Haki Core: With the absolute control of the Haki Ultra Intention, the Observation Haki, Armament Haki, and Conqueror's Haki are Condensed in the upper, middle, and lower Core respectively, and transformed into three Core Seeds hidden in the body. The strength of the three forms of Haki can be increased through fighting, and the three forms of Haki can also be strengthened through self Training of the Core Seeds.]

(Requires the ultimate Haki skill. If others practice it, the upper, middle, and lower Cores will explode and they will die.)

After a while.

A piece of information suddenly emerged in Rosen's mind, waking him up from his thoughts.

...

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