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One Piece: The Half-Blood Ninja Who Hides on the Straw Hat Ship

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Synopsis
Xi Yan, a half-Uchiha and half-Senju, shone brightly during the Second Shinobi World War. While on a mission to the Land of Water, he unexpectedly found himself transported to the world of One Piece, encountering a sea train bound for Enies Lobby! On this speeding train, Xi Yan met a boy carrying a destiny. Luffy: You're a ninja? Xi Yan: Yes. Luffy: Be my crewmate! Xi Yan: Sure, since I'm here, I might as well join. Invited by Luffy, Xi Yan chose to join the Straw Hat Pirates. He then used his power to help his crewmates rescue Robin and protect the ship spirit, Merry! During the Marineford War, possessing the invincible eye techniques 'Takemitsukiko no Mikoto' and 'Kitsu no Mikoto,' Xi Yan unleashed a massive Susanoo that wreaked havoc at Marine Headquarters, showing the Marines what true power was. His two divine weapons, 'Kitsu no Mikoto' and 'Kitsu no Mikoto,' terrified the Marines! Sengoku: Damn it, this guy's just a ninja, why does he possess such immense power?! Kizaru: These newbies are terrifying these days~ Akainu: You evil pirate brat, I'll personally. Xiyan: Come on, let's fight to the death! In the New World, facing a peak powerhouse, Xiyan decisively unleashed the strongest combination technique of the Uchiha and Senju. Sage Art: True Several Thousand Hands! Third Power: Susanoo! Susanoo Set Great Buddha! "If you survive my attack, you can try my Six Paths Power!" Xiyan, having activated his Rinnegan, calmly stated. (Momonosuke and the deserter king are doomed)
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Chapter 1 - Chapter 1 First Encounter

"These guys from Kirigakure really know how to pick their timing," west Yan said unhappily.

On the way to the mission location, we encountered a small skirmish.

Although he wiped out the ninjas of the Land of Water, his ship was also damaged, so he had no choice but to run away.

Fortunately, as a half-Uchiha and half-Senju, his chakra reserves were quite impressive, so reaching his destination was not a problem.

"Once we get through the fog, we shouldn't be far."

"Um?"

Hearing some noise, west Yan stopped and turned to look behind him.

The area was shrouded in fog, making it impossible to see anything clearly; all that could be heard were faint...strange noises.

"Why does this sound like a train?"

"And those two lights..."

Could there really be trains running on the ocean? That's impossible.

In the world of Naruto, technology has not yet developed to this level.

However, to avoid any dangerous situations, west Yan chose to retreat and observe the situation from a distance before making any decisions.

Soon, a gust of wind swept in, dispelling the fog that had been obscuring the view and revealing the true appearance.

This also allowed Xiyan, who had activated his Sharingan, to see clearly what it was.

"Is it really a train that runs on the sea?!" west Yan said in disbelief. "Since when can trains run on the sea?"

"Boom!"

A massive sea train hurtled towards us from afar, splashing up huge sprays of water at an astonishing speed!

"Holy crap, have I time-traveled again?!"

Um?

Why did he say "again"?

...

"Chimney, are you alright?" Nami asked Chimney with concern.

This little guy was clinging to the sea train outside just now, and he almost got thrown off and died.

If it hadn't ended up with the Franky family, the consequences would have been unimaginable.

"I...I thought I was going to die," said Chimney, who was sitting next to Luffy and sticking out her tongue.

"yes."

"You two..." Zoro was at a loss for words.

Luffy is one thing, but this guy just loves doing dangerous things.

But what's wrong with this little girl?

It's one thing to sneak up behind us, but to actually climb onto the top of the train?

"Never mind, we're already here," Nami said, rubbing her temples.

People are already on this sea train, and there's no way they can get off.

All we can do is try our best to ensure the little guy's safety from behind.

"Never mind, let's eat first."

After Luffy finished speaking, he decisively started eating, leaving Barry and the others speechless.

I almost died outside just now, and I still have the appetite to eat. I have a really big heart.

As expected of the Straw Hat Boy?

"Um?"

"Wait a moment..."

"Look outside, isn't there someone running on the sea?" Barry stood up and pointed outside.

Zoro, who was about to complain, paused for a moment upon hearing this, and subconsciously stood up to look in the direction Barry was pointing. His pupils immediately contracted, and he exclaimed, "There really is someone there!"

Instinctively, Zoro placed his hand on the hilt of his sword.

He didn't know why someone could run on the sea, nor did he know why this person was here.

But the appearance of a stranger at this time is not necessarily a good thing.

Who knows if this guy is an enemy?

Where is it?

Where is it?

Luffy, who was eating a large meat leg, stood up, moved closer to Barry, and looked out to sea. He immediately saw the figure running on the sea.

His eyes lit up immediately.

"Wow, that's so cool! He can actually run on the sea!" Luffy exclaimed.

"Could it be those guys?" Nami asked with a serious expression.

She remembered that those guys could fly, so it wouldn't be surprising if they were running on the sea.

The other party is not far away now, and they must find out who it is as soon as possible.

Suddenly, the figure vanished as if it had never existed.

This scene terrified Nami, turning her face green.

Some people aren't afraid, but what does this sudden disappearance mean?

Could it be... a ghost?!

If I remember correctly, there was a bit of fog outside just now.

"Everyone be careful!"

Zoro's eyes immediately sharpened, and his muscles began to tense.

Just then, a man opened the window and said, "Hey, hello everyone!"

These words immediately startled everyone, causing them to turn and look over.

Zoro immediately assumed a fighting stance, ready to strike at any moment.

"Who are you?" Zoro asked.

Zoro looked at Xiyan and found his attire to be very strange.

A green... vest?

He also wore a strange headband with a leaf on it, and a long knife was tucked into his waistband.

What a strange outfit!

A swordsman?

"Me?" west Yan said, stroking his chin after jumping in through the window. "I'm just a passing ninja."

"Would you mind if I hitched a ride?"

As he spoke, west Yan glanced at everyone in the room.

Luffy, Zoro, Nami, Chopper... Although the others were all unfamiliar faces, it was enough for Xiyan to know where he was.

This is the world of One Piece!!!

'Did I really time travel again?'

This was something west Yan hadn't expected. Who knew this thing could travel through time twice?

However, all he saw in One Piece was that they were going to Water 7 to repair the Going Merry; he didn't know how the story would develop after that.

Thinking about this, west Yan felt a bit of a headache.

I should have watched One Piece first.

"You're a ninja?!" Luffy exclaimed excitedly.

Even Chopper, who was lying on the ground, stopped lying there and immediately got up.

This is a ninja!

"Yes, ninjas." west Yan nodded.

Seeing Luffy and Chopper's expressions, west Yan was a little puzzled. Why were they so excited?

"Were you able to run on the sea just now because you're a ninja?" Barry asked.

"Yes, this is a special ability of ninjas."

"Ninjas…" Granny Kokoro walked out of the driver's seat, looked Xiyan up and down and said, "I have heard some rumors about ninjas."

She wondered if the strangely dressed young man in front of her was as she imagined.

"Grandma Kokoro knows?"

"Hmm, I've heard that there are ninjas in Wano Country in the New World." After saying that, Grandma Kokkoro hesitated for a moment, then said, "You…are from Wano Country?"

She was, after all, an old woman who had lived in Water Seven and knew many heroes, such as Roger, so it wasn't surprising that she knew something about the New World.

"Although I don't know which place you're talking about, unfortunately, I'm not from there," west Yan said, shrugging.

west Yan never expected that there would be ninjas in this world. It's really... something that makes people curious.

Is he a Devil Fruit user?

Or is it that some special forces exist in this world?

After all, even unscientific things like Devil Fruits exist, so it's not impossible for other things to appear as well.

"Then... then do you know how to create clones?!" Luffy asked.

"And another thing, can you breathe fire?" Chopper asked excitedly, gesturing wildly.

"And there's more..."

"Stop, stop, hold on." west Yan stretched out his hand and said, "I know everything you're talking about, but the problem is that here, apart from clones, there's nothing else I can do for you."

"The space is too cramped."

If someone were to use Fire Release inside this train carriage, everyone else would suffer terribly. Fire Release isn't truly incapable of killing people!

During the Second Shinobi World War, he killed quite a few people using his Fire Release techniques.

"Then let's create clones!" Luffy said expectantly to Xiyan.

As he spoke, he didn't forget to take a bite of the meat in his hand, which made west Yan's eyelids twitch. He had to admit that Luffy was indeed a worthy successor.

"Clone!"

"Clone!"

"Wait a minute!" Zoro suddenly said.

"What's wrong?"

Xi Yan, who was about to show Luffy his shadow clone technique, stopped and looked at Zoro with a puzzled expression.

Zoro didn't reply to Xiyan's words, but looked at Luffy and said, "Hey, Luffy, don't you think it's suspicious that someone suddenly appears during this sensitive time?"

"We don't even know his name."

More than observing the other person's ninjutsu, he wanted to know who the other person really was; the word "ninja" didn't convince him.

Luffy blinked and looked at Xiyan, asking, "What's your name?"

"My name is west Yan."

Will you hurt us?

"Won't."

Luffy nodded, then looked at Zoro and grinned, revealing his big white teeth.

It's as if they're saying: See, I told you there wouldn't be a problem.

Zoro: ...

Isn't this a bit too casual?

"Let's begin!" Luffy said.

"good."

"Shadow Clone Technique!"

"Bang!"

A flash of white smoke appeared, and an identical clone appeared beside west Yan.

"It's actually true..."

Nami stared at west Yan in disbelief. Could the other party really use such a ninjutsu?

"So, the stories in those folk tales are true?"

"The facts are right here."

"Then it seems to be true."

"It really is a clone!" Chopper stepped forward and pinched Xiyan's thigh, discovering that both of them were physical entities, which made him very excited.

Little did he know that his action made Zoro very nervous.

"Don't worry, I won't do anything to you," west Yan said to Zoro. "If I really wanted to make a move, you wouldn't even see me die."

Zoro didn't believe it; who was this guy looking down on?

west Yan didn't mind; if the opportunity arose, he would naturally let Zoro witness his ninjutsu.

"Amazing!"

Luffy ate the meat in his hand and went up to west Yan, groping him. west Yan's shadow clone was so frightened that it immediately released its hand seals.

"Bang!"

As the shadow clone disappeared, west Yan's expression changed.

"What are you doing?" west Yan asked, taking a step back.

"How did it get off?" Luffy scratched his head and said, "Never mind."

"west Yan, become my partner!"

Ninjas and stuff, that's so cool!

"Huh?!"

"Hey, why would anyone agree so easily..."

"OK."

"They actually agreed?!"

(End of chapter)