Haki

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After a brief discussion, everyone quickly decided to set sail for Jaya Island also known as Spring Island, and the Kuja Pirates' navigator secured a Eternal Pose to guide them.

An Eternal Pose is a special type of compass used in the Grand Line. Like a Log Pose, it records the special magnetic waves of a certain island within the Grand Line, allowing the user to know which way to go to arrive at their destination without changing.

A pose was a vital tool in ensuring safe passage on the Grand Line. Without it, one could easily become lost at sea, a fate that often led to death.

Suddenly, a loud boom echoed across the water, and an enormous Sea King burst from the calm ocean. Its massive head alone was several times larger than their entire ship.

"A Giant Sea King!" one of the Kuja Pirates cried out in alarm.

Most Sea Kings avoided their ship, which was towed by two venomous snakes. However, some of the larger and more aggressive Sea Kings weren't deterred by the serpents.

Shisui and Itachi, standing on deck, were stunned. The Sea King before them was larger than the Nine-Tails, one of the nine tailed beasts, they had faced back in their world.

Hancock prepared to unleash her Conqueror's Haki, but before she could act, the Sea King's eyes transformed into the shape of Sharingan.

"Leave," Akira ordered calmly.

The colossal Sea King's eyes widened in terror, and it immediately submerged itself back into the ocean, fleeing in a panic. The other Sea Kings, who had begun to rise, also retreated. The frightened Sea King cried out to the others in its own language, "Run! Run! That human is terrifying!"

The crisis passed, and the Kuja Pirates were left speechless.

"Amazing!"

"Even a giant Sea King was controlled!"

"Vice-Captain, that's incredible!"

Controlling such a creature meant that Akira and his team could travel freely through the Calm Belt, a region notorious for being the lair of Sea Kings.

"Hmph"

Hancock, though impressed, felt a twinge of irritation. She was the leader of the Kuja Pirates, yet Akira kept stealing the spotlight. Her pride wouldn't allow her to admit it, but his abilities were extraordinary.

---

As the excitement settled, Akira approached the crew. "Ladies, it's a long journey ahead, and there's something I wish to ask."

The crew of the Kuja Pirates eagerly listened. "Vice-Captain, ask away!"

"I want to learn about Haki."

Ever since his parents' deaths in the Naruto world, Akira had realized the harshness of the multiverse. It was a cruel reality, and in such a world, the pursuit of power became his top priority. He would use any method to strengthen himself.

Haki, a powerful force in the One Piece world, was something he couldn't afford to miss out on. While he had the system, he refused to rely on it completely. He preferred to forge his own path.

Hancock's sisters, Marigold and Sandersonia, exchanged glances. "Haki isn't exactly a rare ability in this world. Most warriors from Amazon Lily know it, and those in the New World have mastered it. If you want to learn, we can teach you."

Akira nodded in agreement. "That would be greatly appreciated. The Uchiha clan lacks Haki in our repertoire, so acquiring it would be a significant advantage."

Marigold explained, "There are three types of Haki: Armament Haki, Observation Haki, and Conqueror's Haki. Conqueror's Haki is extremely rare—only one in a million possesses it, and it cannot be learned. Our sister Hancock has that ability naturally."

"I specialize in Armament Haki," Marigold continued, "while my sister Sandersonia excels in Observation Haki. Which would you like to learn first?"

"Let's start with Armament Haki," Akira decided. "It seems more practical for us at the moment."

Without hesitation, Marigold began instructing Akira, Shisui, and Itachi. The three Uchihas absorbed the lessons with unwavering focus, eager to unlock this new power.

Akira had already mastered all breathing techniques, especially Sun Breathing, while Itachi and Shisui had both perfected Fire Breathing. Their extensive training had fortified their bodies to a point that made learning Haki a natural next step.

The breathing techniques were Akira's way of preparing the Uchiha clan to adapt to this world's unique power system, strengthening them to take on any challenge.

Before long, a distinctive black sheen appeared over Akira's palm, signaling his mastery of Armament Haki. He examined the energy coating his hand with keen interest.

"So this is Armament Haki…" he murmured, a hint of satisfaction in his voice.

The speed of his progress was astonishing.

Hancock's eyes widened in surprise. "You're that fast?"

Akira wanted to say at this moment "You will know if I was fast in the future"

The crew of the Kuja Pirates stared in disbelief. Armament Haki was something that usually took a year—sometimes several years—to master. Yet, Akira had grasped it in less than an hour.

Akira flexed his arm, which was now coated in a hardened black substance, akin to steel.

"Hardening!" he announced.

The crew gasped again. No one had ever learned Hardening in less than an hour.

Among the Kuja Pirates, Most can do it as Hardening is the most basic application of Armament Haki. The user clads their desired body part with a black coating.

But it was just so fast and easy for Akira to learn that left them shocked.

Akira clenched his fist and aimed at a barrel on the deck. With a swift punch, the barrel exploded into splinters.

"Cancel" he said in his mind, retracting his Haki.

The crew erupted into applause, astonished by the display of raw power.

Shisui and Itachi, standing by, exchanged a knowing glance. They were used to Akira's rapid growth, but even they had to admit—he was becoming frighteningly strong.

Hancock, though impressed, gritted her teeth. This man, who had come into her world, was mastering abilities that had taken her years to hone. She would have to step up her game if she was to keep pace with him.

As the ship sailed on toward Jaya Island, Akira's mind raced with possibilities. With his new mastery of Armament Haki, he was one step closer to unlocking the full potential of this world—and many others.

...