It could be said that the Kusanagi Sword was the most suitable weapon Naruto could have ever obtained.
For most people, possessing such a weapon would almost be a curse. The sword was extremely demanding. It consumed chakra rapidly and required great control to wield properly. Many ninja would find themselves drained before they could even unleash its true power.
But for Naruto, things were different.
His chakra reserves were enormous—far greater than those of ordinary ninja. What would be a burden to others became a powerful advantage for him.
To Naruto, the Kusanagi Sword was nothing less than a perfect divine weapon.
Naruto held the sword in his hand and admired its sharp, elegant blade.
"The best weapon has finally been found," he said with excitement.
"Now it's time to put that technique into practice!"
Leaving behind the crowded and noisy streets of Tanzaku Town, Naruto headed toward a quiet area outside the town. The place was surrounded by trees and open fields, far away from prying eyes.
It was the perfect training ground.
After confirming that no one was nearby, Naruto slowly drew the Kusanagi Sword.
The blade reflected the sunlight with a cold gleam.
He took a deep breath and began practicing the technique he had learned from the scroll.
Strictly speaking, this technique wasn't simply a ninjutsu.
It was more accurate to call it a Wind Release Ninja Sword Technique.
Naruto quickly formed a series of hand seals.
"Wind Release: Vacuum Sword!"
Following the instructions on the scroll, Naruto carefully circulated the chakra within his body. He purified it, shaping it into Wind Release chakra before channeling it toward the sword.
Normally, performing hand seals while holding a weapon would be extremely difficult.
But the Kusanagi Sword was special.
Naruto didn't need to manually infuse the chakra into the blade.
The sword itself began to absorb his chakra automatically.
The moment Naruto activated his chakra, the sword greedily devoured it.
Bright light erupted along the blade.
"Whoa…"
Naruto's eyes widened.
"That's incredible!"
Wind Release chakra flowed along the blade like streams of glowing wind.
It spun rapidly, creating powerful currents around the sword.
The characteristics of Wind Release—speed, cutting ability, and piercing power—were amplified to their maximum potential.
Naruto swung the sword forward.
With a powerful shout, he unleashed the attack.
The compressed wind chakra surged outward violently, transforming into a razor-sharp wind blade.
The blade shot forward like an invisible projectile.
BOOM!
Bang! Bang! Bang!
The row of trees in front of Naruto was instantly sliced apart.
Each trunk split cleanly down the middle.
Within seconds, the trees collapsed to the ground with loud cracking sounds.
Naruto stared at the destruction in shock.
"What kind of power is this…?"
Even he hadn't expected such terrifying results.
After all, this was his first attempt at using the technique.
If he could fully master it…
The power would become truly frightening.
Of course, the strength of the attack came from two major sources.
First was the technique itself—the Wind Release Vacuum Sword.
Second was the power of the Kusanagi Sword.
The sword's ability to absorb chakra allowed Naruto to pour massive amounts of energy into the attack.
And Naruto possessed an enormous chakra reserve.
The result was like injecting the technique with a powerful stimulant.
Naturally, the destructive power skyrocketed.
Naruto looked at the sword in his hand with growing excitement.
"This really is a treasure."
"With this weapon, I can bring the technique's power to its absolute limit."
Naruto did not waste any time.
He immediately resumed training.
The Wind Release Vacuum Sword was a true fusion of ninjutsu and taijutsu.
It combined Wind Release nature transformation with high-level swordsmanship.
Mastering such a technique was not easy.
However, Naruto already had strong experience with Wind Release techniques.
More importantly…
He had also activated his special ability:
[Wind Release Mastery]
This ability greatly enhanced his understanding and efficiency when practicing Wind Release techniques.
Every attempt brought rapid improvement.
Naruto practiced again and again.
The Wind Vacuum Sword had multiple applications.
At long range, it could launch devastating wind blades capable of slicing through enemies from afar.
At close range, Naruto could coat the blade with Wind Release chakra to dramatically increase its cutting ability.
He could even use the chakra surrounding the sword to create defensive currents that deflected attacks.
In short—
It was both an offensive and defensive technique.
Fortunately for Naruto, practicing this technique was far easier than learning sealing techniques.
Wind Release was his specialty.
However, there were still two major problems.
The first problem was chakra consumption.
The Kusanagi Sword absorbed chakra incredibly quickly.
While this boosted the attack's power, it also drained Naruto's chakra at an alarming rate.
Even Naruto's enormous reserves couldn't sustain prolonged usage without rest.
But Naruto didn't worry too much about that.
"Running out of chakra isn't a big problem," he muttered.
"I have plenty of chakra anyway."
"After resting for a while, I can continue training."
The second problem was more troublesome.
Naruto's swordsmanship skills were not very refined.
His attacks were powerful, but his movements lacked finesse.
The feeling was like holding an incredibly powerful lightsaber but having no real sword training.
He was simply swinging the blade around like a child.
Naruto scratched his head thoughtfully.
"My mastery of the Vacuum Sword is improving quickly…"
"But my sword skills are still terrible."
He sighed.
"I wonder what that Perverted Sage is doing right now…"
"I really need someone who can teach me proper swordsmanship."
After several hours of intense training, Naruto was completely exhausted.
His chakra was nearly depleted.
His entire body felt heavy.
Breathing heavily, he slowly walked back toward the busy streets of Tanzaku Town.
Eventually, he reached the place where he had separated from Jiraiya earlier.
But the moment he arrived—
Naruto froze.
Jiraiya was sitting comfortably at a table, eating delicious food and drinking sake.
He looked completely relaxed.
Naruto's eye twitched.
This situation was unbelievable.
One person had been suffering through brutal training.
The other had been living in paradise.
Naruto's anger exploded instantly.
"PERVERTED SAGE!"
"I've been training like crazy all day!"
"Why are you still here enjoying yourself?!"
"Didn't we agree to look for Tsunade?!"
Jiraiya laughed loudly.
"Oh, Naruto."
"I've already gathered quite a bit of interesting information."
Naruto crossed his arms.
"As if anyone would believe that!"
Then Jiraiya noticed Naruto's exhausted appearance.
"Hm?"
"Why do you look so worn out?"
"What kind of ninjutsu were you practicing?"
Naruto didn't hide anything.
He told Jiraiya everything about the Kusanagi Sword and the Wind Release Vacuum Sword technique.
Jiraiya's eyes lit up.
"The Kusanagi Sword, huh?"
"That weapon really does suit you."
Then he scratched his head awkwardly.
"Unfortunately… I'm not very skilled with swords."
Naruto immediately frowned.
"Just as I thought."
"The Perverted Sage is unreliable!"
Jiraiya burst out laughing.
"Even if I'm not good with swords, I still promised to teach you a new ninjutsu."
"And I always keep my promises."
Naruto's eyes sparkled again.
"A new ninjutsu?!"
"What kind of technique is it?!"
Jiraiya waved his hand lazily.
"You're too tired today."
"Get some rest."
"I'll teach you properly tomorrow."
Naruto wasn't satisfied with that answer.
But Jiraiya refused to budge.
With no other choice, Naruto returned to his room.
Even though he was exhausted, Naruto had no intention of simply resting.
Since Jiraiya refused to teach him tonight, he decided to continue practicing on his own.
Of course, he couldn't practice the Vacuum Sword technique inside the hotel.
Otherwise, the entire building might be sliced in half.
So Naruto took out a kunai.
He began practicing basic sword movements.
Without proper swordsmanship, the Vacuum Sword technique could never reach its full potential.
Naruto was already recognized as a talented ninja.
But he knew the truth.
His achievements didn't come from talent alone.
They came from desperate effort.
"Oh right…"
"I forgot to buy training weights like Lee uses."
"I'll buy them tomorrow."
Naruto clenched his fist.
"I have to work even harder than Lee."
The next morning arrived quickly.
As soon as Naruto woke up, he rushed straight to Jiraiya's room.
Without hesitation, he pushed the door open.
Jiraiya was still sleeping soundly.
Naruto grabbed him and started shaking him violently.
"Wake up, Perverted Sage!"
"You promised to teach me new ninjutsu today!"
Jiraiya groaned and rolled over.
"I drank too much last night… let me sleep a little longer…"
Naruto shook him repeatedly.
Nothing worked.
He even poked Jiraiya with a kunai.
Still no reaction.
Naruto sighed.
Then a wicked smile appeared on his face.
"Sexy Technique!"
In a puff of smoke, Naruto transformed into Naruko.
He leaned close to Jiraiya's ear and whispered sweetly.
"Lord Jiraiya… it's time to wake up…"
The effect was immediate.
Jiraiya's ears twitched violently.
His eyes snapped open.
Before him stood the beautiful Naruko.
"Ahhh! Perfect!"
But Naruto immediately returned to normal.
"Just as I thought!"
"That's the only way to wake you up!"
"You idiot perverted sage!"
Jiraiya rubbed his face helplessly.
"I told you not to call me that…"
He glanced out the window.
"Isn't it still early?"
"Can't you sleep in?"
Naruto grinned excitedly.
"Hurry up and teach me the new ninjutsu!"
Jiraiya sighed.
"At least let me eat breakfast first."
"I need energy before training."
Buzz—
Naruto vanished instantly.
A moment later, a luxurious breakfast appeared on the table.
Jiraiya smiled slightly.
"This kid is pretty clever."
After enjoying the meal, Jiraiya stretched lazily.
"Ahhh…"
"That felt great."
Then he stood up.
"Alright."
"Since you're so enthusiastic…"
"I'll start teaching you now."
Naruto jumped with excitement.
"YES!"
Soon, the old master and the eager student returned to the same training ground Naruto had used the previous day.
And a new stage of Naruto's training was about to begin.
Advance Chapters avilable on patreon (Obito_uchiha)