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One Piece: With Sign-in System

Ron finds himself reborn in the world of One Piece, stranded on a remote island in the East Blue. But he's not just any ordinary child—he’s bonded to a mysterious sign-in system that grants him unimaginable power with every new location he visits. At his first sign-in, he unlocks the legendary Sun Breathing Technique, along with a boost to his vitality. From Shitmotsuki Village to Skypiea, Enies Lobby to Marineford, Ron travels the world, collecting extraordinary rewards that make him a force to be reckoned with. The Raikiri, one of the 21 Great Grade Swords, Armament Haki, Observation Haki, and more fall into his hands. As Ron steps onto the battlefield of Marineford during the legendary Summit War, the mightiest warriors—Four Emperors and Marine Admirals alike—pause, stunned by his presence. But Ron merely waves them off, "Don’t mind me. I’m just passing through." Join Ron on his journey across the Grand Line as he signs in at iconic locations, growing stronger with every step. This is not just an adventure—it’s a legend in the making.

ElvenKing20 · Anime & Comics
Not enough ratings
61 Chs

48: Then Let’s Fight

"Do you want me to go on Zephyr's ship?"

Ron looked at Garp in surprise upon hearing this suggestion.

"Sengoku wanted me to ask if you'd be interested in going," Garp said, scratching his head. "If you don't want to, you can choose not to go."

Ron thought for a moment and then looked at Garp. "Old man, what do you think I should do?"

"Well, if you ask me," Garp replied, nodding at Ron, "if you want to get stronger, you should go. Zephyr loves training talented youngsters. His teaching methods are brutal, but he's top-tier. Once you're on his ship and away from Marineford, he won't be able to resist teaching you. It's a perfect chance to improve your strength."

Garp continued, "Plus, with him, you'll encounter plenty of powerful pirates, which will give you real battle experience and sharpen your abilities."

After listening to Garp, Ron's eyes flickered slightly. Finally, he nodded. "Alright, I'll go."

Three days later.

Zephyr arrived with Ron, who was carrying the famed sword Raikiri, aboard his battleship. Onboard were new recruits from the latest batch of Marines.

"This is Ron," Zephyr introduced him to the group.

"So, this is the specially recruited trainee?"

A young girl with smooth, wavy blue hair, a slender build, and a sword at her waist looked at Ron curiously. Seeing him look her way, she smiled. "My name is Ain, and I'm one of Zephyr-sensei's disciples."

"I'm Binz," said the figure beside her, dressed like a ninja.

Ron recognized them both. Even after Zephyr defected from the Marines, Ain and Binz had stayed loyal to him.

"You're a swordsman, right?" Ain asked, looking at the Raikiri on Ron's back.

Ron nodded.

Not far away, a Marine recruit with crossed arms sneered. "So he's just a kid, as rumored. Why would Zephyr-sensei let this so-called special recruit join us?"

"Shuuji, maybe don't say that out loud," warned his companion nervously. "If Zephyr-sensei hears you, you know what'll happen."

"But I'm not wrong, am I?" Shuuji replied indignantly. "We're heading out to take down dangerous pirates; we don't have time to babysit a kid who probably only got on board through connections."

Suddenly, a familiar voice came from behind him. "Sounds like you're not happy with my decision, Shuuji."

Shuuji stiffened, and his friend broke into a cold sweat at the sight of the tall, imposing figure behind them. "Ze-Zephyr-sensei!"

Shuuji, though terrified, clenched his fists and turned to face Zephyr, his most respected and feared instructor. "Yes, Zephyr-sensei. I believe that allowing someone like him to join us is a mistake. When we're fighting pirates to the death, he'll only drag us down."

Zephyr, wearing his signature sunglasses and purple hair, crossed his arms and looked at Shuuji impassively. "A burden? Don't kid yourself. He's far stronger than you."

Shuuji stared blankly, disbelief clouding his face. "You're saying that kid is stronger than me? That's impossible…"

"Feel free to find out for yourself," Zephyr replied calmly.

Gritting his teeth, Shuuji ignored his friend's warning and stepped forward.

"You're Ron, right?" Shuuji asked, looming over him with a determined stare. "Fight me."

Ain frowned. "Shuuji, what are you doing?"

"Ain, this has nothing to do with you," Shuuji replied, eyes still fixed on Ron. "Everyone on this ship is risking their lives against pirates. I won't tolerate a burden."

"I see," Ron nodded. "Then, let's fight."

Moments later.

Among the new recruits, Shuuji was considered an elite, already proficient in Marine's Six Powers technique, yet here he was, lying on the deck in disbelief, having been easily bested by Ron.

The other recruits stared, open-mouthed, at Ron's calm, collected figure.

"Shuuji… lost?"

"That was so fast! He's mastered Marine Six Powers!"

"Without a Devil Fruit, he beat Shuuji in under ten moves… Incredible!"

"So that's why Ron was specially recruited," one of the recruits murmured.

As Ain shook off her own shock, she looked at Ron with a newfound competitive gleam in her eyes.

"Zephyr-sensei," she asked, "may I spar with him?"

"You can," Zephyr replied, glancing at her. "But no Devil Fruit powers."

"Understood!" Ain's expression was determined as she stepped forward.

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