Uchiha Gate: From Konoha to One Piece

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"You young folks are working so hard. Seems like this old lady can't afford to slack off either!"

"After all, even Naori seems to be working hard to grow stronger."

"Lately, I can clearly sense her power improving continuously. Heck, even her previously blinded right eye has recovered!"

Hearing Tsunade's words, Uzumaki Mito couldn't help but chime in with a smile, setting a goal for herself as she turned to ask Kaito.

If even Uchiha Naori was putting in effort, how could she laze around?

And as a fellow strong woman, Mito wasn't willing to lose to Naori!

"Yeah!"

Kaito nodded in agreement. "My mom's been training diligently!"

"Her eyesight has partially recovered recently, but her visual power hasn't fully returned yet. It'll take some more time."

"Oh, by the way, Lady Mito, if you're serious about training hard, here's something for you!"

Kaito suddenly produced two bottles of longevity pills, handing them to Mito and Tsunade.

"These pills can extend your lifespan by 96 years altogether and even restore your youth!"

"Oh, and Tsunade-sensei, I've got some for you, too!"

"What?! Ninety-six years?!"

"This… It feels wrong to accept this. Haven't you already helped us enough?"

Both Mito and Tsunade hesitated, not immediately taking the pills.

It was clear they felt awkward about accepting more from Kaito. They already owed him too much.

Even though the contract they signed with him gave him some control over them, the benefits they'd received far outweighed any restrictions.

The sheer scale of those benefits was almost overwhelming.

At the same time, they were utterly stunned that Kaito had managed to create longevity pills—pills that could extend life by so much.

The kid was like a walking treasure chest, constantly surprising them!

If word about these pills got out, the entire ninja world would go insane.

This was top-secret information that couldn't leak, no matter what.

"Don't worry about it!" Kaito grinned. "Since you've both formed a contract with me, we're family now!"

"Consider it an internal benefit!"

"Not just you—everyone under contract, like Kushina, Mikoto, and even Minato, will get these!"

"So go ahead and take them without hesitation!"

"I need you all to live longer and stay around. After all, each of you is one of my chosen workers!"

How could he let them live short lives? That'd be such a waste.

He worked hard to build goodwill, after all.

"Huh? Everyone under contract gets them?"

"Even Kushina? But she's just a kid!"

Mito and Tsunade were surprised and couldn't help but chuckle wryly at the thought.

A child barely a few years old starting with life extension pills—what a bizarre idea.

"Hey! Grandma, Tsunade, why can't I take them? It's not my fault I'm young!"

"And besides, these pills will improve my vitality and life force. They'll massively boost my chakra reserves and chakra training!"

Kushina pouted and argued back.

Well, even though the pills' chakra training benefits were more of a bonus side effect.

"Alright, alright, we won't say anything!"

Mito and Tsunade waved her off with amused smiles.

Then, they turned to Kaito and said, "In that case, we'll accept them for now. We'll make it up to you through hard work in the future!"

With that, both of them opened their bottles and found five pills each.

"This many?"

They were stunned.

"Yeah," Kaito confirmed. "The first pill adds 50 years of lifespan. Each subsequent pill adds half the amount of the previous one, totaling over 96 years. Take them yourselves for now!"

"And don't even think about giving them to anyone else!"

"No problem!"

Mito and Tsunade weren't ungrateful people, so they promptly took the pills.

Immediately, they felt as though they were soaking in a hot spring. A wave of comfort swept through their bodies.

As top-tier medical ninjas, they could sense their life force and vitality increasing dramatically.

Even more astonishingly, their cellular activity accelerated, radiating vitality as their bodies began to rejuvenate.

Mito's aura grew stronger by the second, clearly surpassing her previous recovery state.

It was evident—her last recovery didn't fully restore her to her peak condition.

But now, she was back.

If not for the sealing barriers in place, her transformation would've likely alarmed others.

Visibly, Mito appeared at least twenty years younger.

She no longer needed to rely on her Yin Seal to maintain a youthful form. She could naturally stay as vibrant as a 20-year-old.

Her entire being exuded energy, and the traces of old age were entirely gone.

"This feeling… It's been so long!"

Mito clenched her fists and stretched her body, a bright smile on her face.

Meanwhile, in her inner sealing space...

Kurama, the Nine-Tails, felt the explosive growth in Mito's life force and the increasing stability of the seal.

Startled, Kurama raised its head and cursed.

"What the hell?!"

"This damn woman fully restored her youth?!"

"And her lifespan just got extended again?!"

"Damn it! Damn it! Damn it! When will this nightmare end?!"

"Old Sage! This isn't fair! This future doesn't match what you predicted at all!"

"What blue-eyed boy? Feels like this damn woman's gonna keep me sealed till the end of time!"

"Damn It, Just Kill me."

Not that it had a lifespan limit itself, but still…

This seemingly endless imprisonment was driving Kurama insane.

It felt utterly stifling!

"Damn Uzumaki Mito! Damn Uchiha Madara! And damn Senju Hashirama!"

"You're all cursed!"

Kurama ranted and cursed furiously in the sealed space, venting its frustration.

Of course, Uzumaki Mito had long noticed this.

So, to avoid dealing with its outbursts, she temporarily silenced the sealing space. The sounds and noise within were completely blocked out.

If she couldn't hear it, it didn't count as being cursed.

Besides, there was no way she was going to release Kurama anytime soon.

At least not in the short term.

Unless there came a time when she no longer needed Kurama's power, could easily subdue it, and releasing it posed no threat to her life, then she might consider setting it free.

Having been Kurama's jinchūriki for decades, she knew very well that the Nine-Tails wasn't some embodiment of pure evil.

It was intelligent and wise, even rivaling human intelligence.

It wasn't just a mindless beast bent on destruction.

In fact, Kurama hadn't done anything wrong in the past.

It was simply unfortunate enough to be caught and sealed by her.

Honestly, she felt a little guilty about it.

But then again, it was Kurama's bad luck to be captured by Uchiha Madara, contracted, and forced to fight Hashirama.

In the end, Kurama was too weak.

If it hadn't been caught by Madara and used against Hashirama, it wouldn't have ended up sealed.

Sometimes, being weak is the greatest crime.

"Thank you so much, Kaito! Truly! This feeling of being light and young again—I haven't felt this in so long!"

Uzumaki Mito spent a while moving around, savoring her restored youth, before sincerely thanking Kaito.

"Me too! Thank you!" Tsunade added with equal gratitude.

She was beginning to think that taking on this apprentice was the best decision she'd ever made.

"No need to thank me again! You've already done that."

"By the way, we're planning to head to the Pirate World to train in swordsmanship. Want to come along and have a look?" Kaito casually offered.

At the moment, Kaito had already mastered the basics of swordsmanship and was now learning the Isshin-ryu sword style from Koshiro.

(A/N: I'll use Koshiro instead of Koushirou as it's more common.)

In just two days, Kaito had progressed to the proficient stage of Isshin-ryu, once again astonishing Koshiro.

Koshiro's respect and fondness for Kaito had grown immensely, and the relationship between them was steadily moving toward a formal contract.

"Really? We can go? Then let's check it out! I've been curious for ages!"

"Me too! Just hearing about it has been exciting. The Pirate World sounds so fascinating—completely different from the oppressive atmosphere of the Ninja World!"

Both Mito and Tsunade's eyes lit up with excitement, their faces full of longing for the Pirate World.

That world was so much larger than the Ninja World.

"Of course! Since you're under contract, you can travel freely to the Pirate World anytime!"

"However, it's not the right time to make the Pirate World public knowledge."

"So every time you go, make sure to handle any pending issues here first."

"It's best to leave a shadow clone behind in the Ninja World as a stand-in."

Kaito nodded as he explained the situation.

Once he unified the Ninja World, he might consider revealing some information about the Pirate World—possibly under a different guise.

Or maybe not. He'd decide when the time came.

For now, his plans always prioritized his best interests.

"Got it, we'll be careful!"

Mito and Tsunade nodded earnestly.

They immediately created shadow clones to stay in the Ninja World, then followed Kaito to Shimotsuki Village, where they had purchased a house.

"Kushina, you don't need to train in swordsmanship today. Instead, why don't you show Lady Mito and Tsunade-sensei around this world?"

"Just be careful!"

As soon as they arrived, Kaito turned to Kushina.

"Sure! Leave it to me!" Kushina eagerly agreed.

She grabbed Tsunade and Mito by the hands and happily led them out to explore the island.

Meanwhile, Kaito and the others headed to the Isshin Dojo to continue their swordsmanship training under Koshiro.

"Kaito, for now, focus on perfecting your basic swordsmanship while supplementing it with Isshin-ryu techniques."

"I feel like you're already close to reaching the Swordmaster level."

"If you lay a solid foundation, it'll benefit you immensely when breaking through to Swordmaster or even Great Swordmaster levels."

"Don't underestimate the importance of the basics, got it?"

Koshiro couldn't help but advise Kaito after seeing his rapid progress in both basic and Isshin-ryu swordsmanship.

Back in the day, Koshiro had achieved mastery in basic swordsmanship before branching into Isshin-ryu. By combining it with real combat, he gradually ascended to Swordmaster and eventually Great Swordmaster status.

"I understand, Master! That's exactly what I was thinking too."

"From the start, I noticed that the higher my basic swordsmanship skills, the faster I can progress with Isshin-ryu techniques!"

"The two are closely connected!"

Kaito nodded firmly in response.

He knew his teacher worried that he might be too ambitious and squander his talent.

But Kaito had the Heaven Rewards Diligence talent, which allowed him to have constant progress.

This sensation made even the basics utterly engrossing—hard to stop practicing.

So there was no chance of him getting impatient or neglecting the basics just because he had advanced techniques like Isshin-ryu.

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