Pirate: This Marine has two Rinnegan.

One Piece: This Marine Has Two Rinnegan (Author: Beishan Yumu)

Synopsis: No system + Navy theme + Rinnegan + Reasonable growth without setbacks + Various powerful Devil Fruits

Uchiha Chiga, who traveled from Earth to the Naruto world, was transported to the One Piece world the moment he activated his Rinnegan.

Here he discovered that his Rinnegan could absorb the power of Devil Fruits, gaining one more tomoe for each one he absorbed!

With the devastating power of Logia-type Devil Fruits, the magical and ever-changing power of Paramecia-type Devil Fruits, and the unparalleled vitality of Zoan-type Devil Fruits, he became the only Sage of Six Paths in the One Piece world after collecting all twelve powerful Devil Fruits!

Chapter 1 The Boy from Cocoa West Village

East China Sea, Cocoyasi Village

"Chiga, are we going out to sea today?"

An old woman stood at the entrance of the butcher shop and called out to a young boy. The boy was tall and slender, with a handsome face. He was nearly two meters tall, with a cold expression, his black hair was casually tied up, his skin was fair, and he was wearing a black robe with a pattern resembling a ping-pong ball on the back. He was also wearing a pair of brown gloves.

What's most unforgettable about him are his eyes—purple eyes, each with rings of black lines, exuding mystery and danger.

A smile appeared on the boy's cool face as he nodded to his grandmother.

The boy's name is Uchiha Chika. To be precise, he does not belong to this world. He originally came from a planet called Blue Star. He was an orphan who accidentally traveled to the world of Naruto in the Blue Star manga and became a member of the Uchiha clan.

There, his parents, who had given him the name Uchiha Chika in his second life, died on the battlefield. With his memories from his previous life, he became friends with Minato Namikaze from the early days. After learning the Flying Thunder God Technique, he believed he had the strength to protect himself. Then, he faked his death during a mission and stayed outside Konoha.

He then secretly developed his power outside, using the memories of Blue Star to make a deal with Orochimaru with some information. Finally, with Orochimaru's help, he successfully fused the power of the Uchiha and Senju and awakened his own Rinnegan.

Unexpectedly, while he was immersed in the joy of opening his eyes, he was ambushed by Orochimaru. He overused his newly born eye power and used spatial power that he was not yet proficient in, and then lost consciousness.

When he regained consciousness, he was already on a small island, and his body had regressed to the state of a six-year-old.

He quickly checked his physical condition after the transmigration. Fortunately, the Hashirama cells and Rinnegan he had worked so hard to obtain were still there. However, due to physical degeneration and overdraft of his eye power, he could not use much of his strength.

After all, this wasn't his first time traveling through time, so he quickly composed himself and spent a day exploring the island before finally finding the village called Cocoyasi.

When he saw a woman with burgundy hair and two little girls named Bellemere in the village, his distant memories from his past life reminded him that he had come to the world of One Piece.

Since he was already there, he decided to make the best of it. The villagers were kind and hospitable. Although his eyes frightened them, Granny Lisa, who ran the butcher shop, couldn't bear to see a six-year-old child wandering around and took him in.

After that, he settled down in the village, patiently waiting for his body to develop and adapt to the power of his eyes, and it has been ten years now.

He is sixteen years old this year.

"It's almost done. Although the overexertion at the time prevented my Rinnegan's exclusive skills from developing, due to the special nature of the food and other aspects of the One Piece world, my body seems to have developed even stronger than before. Hashirama's cells have also perfectly fused with my body. As expected of a world where almost everyone is a tank, this is a blessing in disguise," Uchiha Chika thought.

Clenching his fists and feeling the surging power within him once more, Chiga's emotions surged.

Based on the combat power depicted in the anime from her previous life, Chiga estimated that without using any special abilities, her current strength had reached the level of an ordinary vice admiral in the Navy, but she was still quite a distance from becoming an admiral.

However, it is believed that with better physical development and subsequent exposure to the power system of the One Piece world, it is inevitable that he will surpass Chiga from his previous life and become the top in this world, and this process will definitely not take long.

"It's time to set sail and see the world of One Piece. Maybe I can break through again here and become a true Sage of Six Paths."

In this life, he plans to temporarily join the Navy.

Joining the Navy was partly because, as a former Earthling, I had a stronger sense of identification with the military and was more resistant to becoming a pirate. After all, although the Navy in the pirate world had some corruption and bad aspects, it was generally good, and the Navy was, after all, the official body.

Aside from the main characters and a few other pirates, most pirates are ruthless criminals who commit murder, arson, robbery, and all sorts of evil deeds. Chiga doesn't consider himself a pushover; he killed those who offended him during the Naruto era, but he still has his own moral bottom line.

On the other hand, joining the Navy would allow one to learn about the power system of this world and have more opportunities to experience the unique features of the pirate world, such as Devil Fruits.

He doesn't intend to eat a Devil Fruit. With the Rinnegan, he already possesses six chakra nature transformations, so the Logia type is of little use to him.

Furthermore, the thousands of ninjutsu he copied during his Sharingan era didn't really require the so-called Paramecia type, and as for Zoan type, they were useless to him since he already possessed a Sage Body through Hashirama's cells.

So why add the disadvantage of being unable to swim to his life? But he had one thought he wanted to confirm: could his Rinnegan's Preta Path affect the abilities of Devil Fruit users or other Devil Fruit users? And could he use the power of a Devil Fruit to evolve his Rinnegan again?

He had a premonition that this might be the opportunity for him to break through his limitations.

Gathering her thoughts, Chiga decided to go out to sea one last time to fish, this time aiming to catch as much as possible, since her mother-in-law's supply of fish might become scarce after she left.

Chapter 2 The Proper Use of the Rinnegan

Chiga set sail in her small boat.

He steered the boat to an area with abundant fish, then cast a huge net into the sea. He lay down on the small boat to rest for a while. The fishing resources in One Piece are quite rich, and soon Chiga felt his small boat begin to rock.

With a slight pull of one hand, Qianhe dragged the fishing net, which was filled with all kinds of fish and shrimp, up into the water. The net contained a large number of fish and shrimp, all struggling desperately.

Chiga raised her hand and unleashed a very weak Lightning Release ninjutsu at the fish and shrimp in the net.

Lightning Release: New Energy Fishing Net Technique

A dense current of electricity emanated from Qianhe's palm, instantly enveloping the entire fishing net.

The fish and shrimp in the net were immediately captivated by the new energy fishing net and became docile.

"Hmm, not bad." Qianhe was satisfied and prepared to leave when suddenly, a huge wave rose on the sea, and a giant eel's head emerged. Then, half of its body burst out of the water, reaching a length of several tens of meters. Its blood-red eyes were fixed on Qianhe and the prey in his hand.

"A sea king? Could it be the only one in this area?" Chiga thought to herself, staring blankly at the enormous creature before her.

As the weakest of the four sea areas, especially in such a remote area, the East China Sea is actually quite scarce for sea monsters.

However, although the Sea Kings looked intimidating, in Chiga's eyes they were just larger fish. After witnessing the world-destroying power of the Tailed Beasts in Naruto, the larger Sea Kings were simply not worth mentioning.

"Fine, I'll use you to test the power of these eyes, though it's a bit of an overkill." Chiga looked up at the Sea King.

The sea king was looking at the tiny human beneath it and the pile of prey in its hands, preparing to feast, when it saw Chika raise her head and meet her purple Rinnegan eyes.

It instinctively felt a suffocating fear and subconsciously tried to escape, but it was too late.

Rinnegan Genjutsu

An invisible wave spread out, and the sea king was suddenly startled. Then its eyes turned into the same Rinnegan pattern as Chiga's, and its life force began to rapidly disappear.

The Rinnegan Genjutsu, a technique Sasuke used in the original Naruto manga to control several tailed beasts with a single glance, was clearly a devastating blow to a sea king several tens of meters long. It couldn't withstand the mental impact at all, its consciousness was completely obliterated, and it plopped down on the water's surface and sank.

"This is much more useful than any Conqueror's Haki, but we can't just waste such a big chunk of meat like this." Chiga watched the sinking Sea King, then raised his hand again, a black vortex appearing in his palm.

All things are attracted by heaven!

A tremendous force of attraction emanated from Qianhe's palm, instantly drawing up the massive, tens-of-meters-long sea king corpse.

Sucking the corpse towards the stern, Chiga turned her head to look towards the island where they had departed, roughly estimating the distance. Then, she slightly opened her Rinnegan.

Shinra Tianzheng!

Another powerful repulsive force emanated from Chiga, instantly pushing away the Sea King's corpse and causing it to disappear without a trace.

It's worth mentioning that Chiga's Rinnegan belongs to her personally, unlike Nagato's which requires sacrificing one's life. She can also use basic Six Paths abilities like Shinra Tensei without any ridiculous 5D effects, and its power increases infinitely with the growth of her chakra and stamina.

(This is the author's setting. In One Piece, people have very strong physical strength. After the protagonist is modified in this world, his body will definitely be many times stronger than in his previous life, which is convenient for describing his strength.)

Watching the sea king disappear from sight, Chiga clapped his hands in satisfaction.

"Yes, this is what they mean by 'an army marches on its stomach.'"

Chapter 3 The Bellemere Family

When Chiga steered his small boat to the shore in the direction the Sea King had pushed, he found the Sea King's corpse, with its white eyes, already pushed ashore. A group of villagers were gathered around the corpse, chattering about the Sea King that had suddenly appeared.

"This...this is a Sea King, how could it be here?"

"I don't know, could it be a gift from nature?"

"God, what a gift from nature! Even if such a large creature were washed ashore by the waves, it couldn't possibly be pushed this far, could it?"

"How is Chiga doing? Go out to sea and look for him, it's very dangerous right now."

"Yes, all the young and strong ones, come with me to search, just in case something happens."

……

In the crowd, Bellemere, with her pink hair, stood with eight-year-old Nami and twelve-year-old Nogigo, arms crossed, silently watching the corpse of the Sea King before them.

The lively Nami pointed at the Sea King's corpse and said curiously to Bellemere, "Bellemere, look, what a huge fish! This is the first time I've ever seen such a big fish!"

"I wonder how Qianhe is doing. He must have gone out to sea to fish today, right?"

The quieter Nokiko, standing nearby, was worried about Chiga. Bellemere patted their heads without saying a word, a hint of worry flashing in her eyes as well.

Having been a naval officer, she deduced from the state of the sea king's death that it was caused by human intervention.

"When did such a powerful figure appear in the East Blue? Is he a Marine? If he's a pirate, that's troublesome. I don't care about myself, but Nami and Nogiko..."

Bellemere clenched his fist.

"No matter who it is, if they try to hurt them, I'll protect them even if it costs me my life!"

At this moment, Chiga, who had just come ashore, arrived at the body, and the surrounding villagers quickly gathered around.

"It's Chiga! You're finally back! There was a Sea King, and Grandma Lisa was so worried!"

"Yes, yes, don't go out to sea lately. Sea kings have appeared. Your little boat will capsize if it encounters one."

"Brother Qianhe!" x2

Two little ones emerged from the crowd and hugged Chiga tightly to his legs; it was Nami and Nogiko.

"Are you alright, Chiga? These two kids were so worried about you," Bellemere squeezed in as well.

Nokiko blushed slightly, clinging tightly to Chiga's leg without uttering a sound. Nami, on the other hand, was like a lit firecracker, jumping off Chiga's leg and shouting that she didn't, she just didn't want no one to catch fish for her in the future!

Chiga felt a surge of warmth from the concern shown by those around him; this care was invaluable to him, given his years of trepidation in the Naruto world.

Shaking his head, Qianhe smiled and said to the people around him,

"I'm fine, thank you all for your concern. As for the danger, there's no need to worry. This sea king is my prey."

After Qianhe finished speaking, he found that the surroundings suddenly became quiet, and people were staring at him blankly.

After a while, Nuoqi Gao suddenly jumped a few times with her hands outstretched. Qianhe looked at her strangely, realizing that her behavior was a bit silly. Nuoqi Gao blushed and stammered worriedly,

"Brother Qianhe, are you scared out of your wits, or do you have a fever?"

Nami next to her had the same expression, as if to say: Me too!

As soon as he finished speaking, the surrounding villagers burst into laughter.

"Haha, Chiga, even a kid thinks you're abnormal."