I'm in Naruto, but the system says I'm in One Piece.

"It's nothing," Hoshino Yu said, coming back to her senses and turning to look at the water column. "Keep practicing. This is just the beginning. You've got plenty of time to practice."

Upon hearing this, Shui Zhu could only nod slightly.

Hoshino Yu is absolutely right. Having just discovered his perceptive talent, he needs to continue practicing diligently.

Minato has already graduated ahead of schedule, so I need to hurry up too.

However, he has another problem.

That's what we should call this perceptual ability.

Shuizhu thought for a moment, then asked Hoshino Yu:

"Yu, what do you call this perceptive ability?"

"It should have a really imposing name, right?"

Hoshino Yu raised an eyebrow, thinking to himself, "You really picked the right name, kid. This thing is called 'domineering'."

He then spoke:

"Yes, it's written in my novel, isn't it? The name is Observation Haki."

"Wow, it really is Observation Haki?!" Water Pillar stared blankly. "Could what's written in the book be true?"

"What, really?"

"One Piece!"

Hoshino Yu smiled and said:

"If you think so, then so be it. Anyway, what we're practicing is indeed called Observation Haki."

After explaining, the two continued practicing.

They practiced until around seven o'clock, and it was only when Minato came to find them that the two had to stop their training.

At this moment, Minato noticed that the two were covered in sweat, and that the Water Pillar was emanating a certain aura that only Hoshino Yu possessed, which puzzled him.

"Senior Water Column, what's wrong with you...?"

"Did you notice, Minato?" Hoshino Yu chuckled. "You're quite perceptive."

"You guessed right, the water pillar has also developed the same Observation Haki as me."

Upon hearing this, Minato looked on incredulously.

Hoshino Yu had told him about Observation Haki.

For him, this perceptive ability is quite useful on the battlefield, and according to his friend Hoshino Yu, Observation Haki can perceive all details, making it no different from a second pair of eyes.

Moreover, these eyes are immune to eye-to-eye illusions.

He had practiced before, and although progress was slow, at least there was some hope.

But what's going on with the water column?

I've seen their talent firsthand; they shouldn't be able to grasp Observation Haki so quickly.

However, as a friend, he was genuinely happy.

Who wouldn't want their friend's strength to increase rapidly so they can safely weather the upcoming war?

As one of Orochimaru's disciples, Minato was naturally no longer ignorant of the situation in the ninja world, unlike before.

Or perhaps, under Orochimaru's months of tutelage, he had a clearer understanding of political issues than Hoshino Yu, the transmigrator, and knew that war was likely to break out soon.

Therefore, it would be best if the strength of those around him could increase rapidly, and he did not want to see his friends leave one by one after the war.

Of course, that includes himself.

Under Orochimaru's prompting, Minato also learned why Kushina, a member of the Uzumaki clan, had come to Konoha.

His only goal was to become a Jinchūriki of a Tailed Beast.

Therefore, Kushina would never be able to go to the battlefield. Even if she became a Jinchūriki, she would be strictly forbidden from leaving the village, so she would not be in any danger.

But he and Hoshino Yu and the others were bound to go to the battlefield.

Therefore, in order to live in the future and to see his friend alive, he would definitely work hard to cultivate.

Seeing Minato's reaction, the water column beside him immediately stepped forward, put its arm around his shoulder, and laughed:

"Hey Minato, I'm in the lead this time!"

Seeing this, Minato laughed:

"Senior Water Column is truly amazing, but I will work hard to catch up with you all as soon as possible!"

Upon hearing this, Hoshino Yu, standing to the side, shook his head helplessly and said:

"Stop messing around, buddy. You've already started to master the Flying Thunder God Technique. If you also master Observation Haki quickly, how are we slackers supposed to survive?"

Minato simply smiled and shook his head.

"Yu, as you know, the Flying Thunder God Technique is extremely difficult to learn. It took me two months to study it and I only managed to figure out a little bit."

"However, it's unlikely to be effective in combat for the time being."

Hoshino Yu nodded slightly upon hearing this.

That thing really can't be mastered quickly.

Even Minato Namikaze only mastered the Flying Thunder God Technique in his youth, thus earning the title of Yellow Flash in the ninja world.

To learn the Flying Thunder God Technique, the first requirement is excellent spatial ninjutsu perception, the ability to understand and manipulate spatial coordinates, plus outstanding talent in summoning techniques. And that's only part of it.

In addition, one must be able to sense the location of chakra and techniques several kilometers or even tens of kilometers away, and instantly analyze the battlefield situation. One must also have a huge amount of chakra to support the consumption of the Flying Thunder God Technique.

They must also be able to process complex information such as the location before and after the transfer and the enemy's dynamics in an instant, make the best judgment, and master the ability to instantly write curse seals.

Only with these abilities can one truly master the Flying Thunder God Technique.

Otherwise, do you think that in such a large ninja world, only the developer Tobirama Senju and Minato Namikaze could master the Flying Thunder God Technique so well?

Individually, you could find many people who fit those criteria, but when you combine them all, only these two people have emerged in the entire ninja world.

To put it bluntly, Tobirama Senju probably wasn't as skilled at the Flying Thunder God Technique as Minato.

This is why Hoshino Yu felt this way.

I used to think it was really cool when I saw Minato use the Flying Thunder God Technique in the anime. If I had the chance to travel to the Naruto world, I would definitely want to learn it and try it out.

But after trying it, I realized that I had absolutely no talent in that area.

Aside from his excellent spatial ninjutsu perception and ability to instantly create curse seals, Hoshino Yu possesses all of the above qualities.

However, he doesn't need the Flying Thunder God Technique; the speed provided by the Rumble-Rumble Fruit is not necessarily inferior to that of the Flying Thunder God Technique.

Furthermore, elemental movement ignores distance, unlike the Flying Thunder God Technique where the chakra fluctuations cannot be sensed due to distance, thus preventing movement.

Now that all three have developed their own methods, their future looks promising.

Hoshino led the three to BBQ Q for a delicious meal before they all went home.

During their previous missions, Minato and Hoshino Yu could be said to have had almost no restful sleep.

Short periods of rest at night and rotating patrols are essential lessons for ninjas; they must become ingrained habits.

At this moment, Hoshino Yu was lying in bed, trying to practice Armament Haki.

Although the task of training Observation Haki with water pillars is not yet complete, I still have to give it a try.

There's no need to elaborate on Armament Haki; it's impossible to learn without talent.

[You have received the main quest: Luffy awakens his Observation Haki for the first time. Train with him and help him master the techniques as soon as possible.]

[Mission Reward: Initial Awakening Opportunity for Armament Haki]

Current progress: 50%

"The mission is only halfway complete at this stage. What will be the trigger for this awakening?"

Hoshino Yu shook his head slightly and could only close his eyes and calmly cultivate.

However, while he desires peace and stability, others cannot.

Through his Observation Haki, he could sense that a small ninja squad of several dozen people from Konoha was speeding towards the edge of the village.

"Tsk, what kind of trouble have they gotten themselves into now?"