One Piece: The user of the Nen-Nen Fruit, who overturned the sea.

night,

In the open space in front of the castle, the group once again sat around the campfire, celebrating the day's battle.

"Mihawk performed well today. To have such a performance in his first real battle is truly worthy of being Saga's disciple."

Hawkeye blushed slightly and turned his head away: "It's still a long way off."

Barrett ate the grilled meat with gusto: "Those pirates are too weak, they're no match for us."

"It's not that the pirates are too weak, it's that we've become stronger. If we were just setting sail, it would take us much longer to deal with them."

"Tezzolo is right, we have indeed made a lot of progress recently..."

Roy nodded in agreement, then changed the subject and became serious.

"This also reminds us that there is never a shortage of enemies on the high seas, and we must continue to become stronger. I don't want to be unable to withstand even a single blow from an enemy like the Golden Lion next time we encounter one."

"So, I've decided to train on the island for four years, and when I turn sixteen, I'll officially set sail, form a real pirate crew, and make our names resound throughout the world."

No one objected to Roy's decision.

The campfire crackled, reflecting the determination on everyone's faces.

"Four years..."

"This is enough time for our bodies to fully grow and for us to improve our strength more systematically. I don't want to hide behind the boss and Barrett in every battle."

Barrett patted Tezzolo on the shoulder in comfort, then grinned.

"I'll give it another try with the Golden Lion then!"

Savi excitedly pulled Pea along, jumping and skipping.

"Great! Then we'll be a real pirate crew!"

Stella flipped through her notebook, writing something rapidly, her eyes gleaming with anticipation. Even Hawkeye, standing beside her, unconsciously tightened his grip on his black sword, Night.

Saga sat to the side, listening to the young people's bold words, and couldn't help but feel happy for them.

The next morning, people had already gathered in front of the castle.

Roy set the next training goals for everyone.

"Our goal for the first year is to continue improving our physical strength and training in both types of Haki. For combat, we'll go find the monkeys on the island."

"I will cover a gravity zone within a radius of three kilometers, and you can find the level that suits you best."

"As for the development of Devil Fruits, we are mostly Zoan-type, so you just need to keep fighting."

"clear!!"

Seeing that no one had any objections, Roy activated the gravity field, setting up four zones.

There's the area with three times the gravity of the outermost edge, five times the gravity of the second ring, eight times the gravity of Roy's own area, and then there's the area with ten times the gravity that Barrett insisted on.

The training that followed was brutal. Every day before dawn, they would head to areas with gravity they were used to, frantically expending their energy. Only when they were completely exhausted would they seek out opponents for basic combat.

Sometimes it's a two-on-one battle, and sometimes Tesoro and his group "one-on-one" against Barrett.

While training his physique, Roy also had to focus on developing his swordsmanship and Devil Fruit abilities.

His Observation Haki was no longer content with exploring the mind; he wanted to develop it in the direction of predicting the future.

Roy already has the gravity aspect, including area-of-effect gravity suppression and the single-target attack "Singularity." Further development is too complex and there's not much of a clue yet.

Future development will focus on the manipulation of external objects, aiming to achieve greater precision, a wider range, and longer duration of control.

Ideally, it should be comparable to the "Tornado" from "One-Punch Man," capable of pulling down meteorites from the sky or dragging the Monster Association headquarters from thousands of meters underground to the surface.

After all, in this world full of oceans, the ability to control seawater is the biggest cheat code.

When I attack, the sea will surge and thousands of meters of water will rush towards the enemy. For those who are not strong enough or who have Devil Fruit abilities, what kind of despair will that be?

Roy was happy just thinking about it.

At night, after the group of young people had finished, Saga would also share his experiences of traveling the sea in his youth or his understanding of Haki with them.

"The highest level of Observation Haki is the ability to foresee the future, while the ultimate form of Armament Haki is to make it flow, thereby causing internal destruction..."

After several attempts by Saga to unleash attacks that disrupted the internal workings of Armament Haki, Roy and Barrett also began trying to make Armament Haki flow.

With Roy's help, Hawkeye experienced the feeling of Observation Haki and Armament Haki several times and successfully awakened them. All that's left is to hone his Haki.

The following year, everyone began to specialize in their own areas.

After breaking through to the level of a swordsman, Roy also began to attempt a perfect fusion of his Devil Fruit ability and swordsmanship.

According to Saga, each great swordsman breaks through in a different direction, and only by finding one's own way of the sword can one enter that realm of swordsmanship.

Roy didn't have any good solutions to this; he could only learn through more battles in the future.

The Devil Fruit ability involves activating a gravity field and then using all of one's psychic power to lift the entire island off the sea surface, thus maintaining its levitation.

Whenever he could no longer hold on, the enormous commotion as the island sank into the sea would cause the apes on the island to riot, thus launching an attack on the people cultivating around the castle.

Roy was pleased with this.

Barrett continued with his physical training, and during the conversation, he learned about Garp's training methods.

He also began to strike the mountain with his fists every day without using Haki.

It had adapted to an environment with ten times the gravity, so Roy was asked to set up a zone with twelve times the gravity.

I enjoy doing it every day.

Since Tesoro hasn't eaten a Devil Fruit yet, he can only focus on training his physique and martial arts skills, and has even cultivated his life return technique.

The two-tone design has also been significantly enhanced in terms of its imposing presence; all that's missing is the finishing touches.

As Barrett's biggest fan, Savi didn't need Roy to worry about him at all; Barrett had already set the requirements for him.

He was also the "most miserable" one among them. Every time he finished his physical training, he would be "punished" by Barrett, leaving him bruised and swollen, which made Roy feel sorry for him.

Stella is focusing more on developing her Devil Fruit abilities, better integrating her magnetic field perception with navigation skills.

Pea was the most carefree. Roy created a gravity-controlled area just for him, where he cultivated various seeds, developed his abilities, and even created a small garden.

Saga would occasionally have tea and chat with this little guy who resembled Roy.

Time flies, and the third year of training is drawing to a close, with everyone's strength making a qualitative leap.

That morning, Roy stood atop the castle, eyes closed in deep thought.

The entire island, along with the surrounding seawater within a 3,000-meter radius, slowly rose into the air under his control, quietly hovering at a height of 200 meters above the sea level, remaining steadily in place without the slightest tremor.

This kind of control over the scope has long been the norm for him; what he is now pursuing is a more refined level of improvement.

Barrett was sweating profusely in the 15x gravity zone, each punch leaving a hole the size of a human body in the mountainside.

After three years of arduous training, his physique had become outrageously strong. One can imagine how much power he could unleash in the absence of gravity.

Deep in the forest, Roy and Hawkeye's sparring session could go on for a whole day.

Both men have their own strengths in swordsmanship. Roy's swordsmanship incorporates his Devil Fruit ability, while Hawkeye's swordsmanship is becoming increasingly fierce.

"Not enough!" Hawkeye said after a sparring match. "I want to create my own way of the sword!"