Immortality begins with the ninjas of Konoha.

In July of Konoha Year 43, the Ninja Academy resumed its "private tutoring" program.

Students can choose to participate in outdoor survival training camps organized by the school, or they can use this time at their own discretion and make their own arrangements.

In the training ground on the hill behind the school, Matt Kai sat leaning against a huge tree, his eyes fixed on the two people colliding above him.

"bite..."

The crisp sound of kunai colliding continued. Kakashi, wearing a ninja headband, dashed across the thick tree trunk, leaped repeatedly, paused slightly, gathered his strength, and bounced back to close the distance again.

Kakashi swung his kunai around in quick succession, sparks flying from the impact. Seeing Furukawa Osamu swiftly flip over his head, he quickly twisted his body.

Kakashi ducked to block, sparks flying again. After narrowly dodging the continuous attacks, he attempted a counterattack with a high kick followed by a swift twist and thrust at his opponent.

In the instant of his dodge, he precisely clamped his arm, and Furukawa Osamu's left-hand kunai successfully blocked the attack. Before Kakashi could even put up a fight, it turned into a puff of smoke with a "bang".

"Shadow Clone Technique!"

The thought had barely crossed his mind when Kakashi noticed the kunai behind him. His previously sharp gaze returned to a deadpan expression, and he let out a long breath, saying in a low voice:

"When did you use Shadow Clone Jutsu?"

"That's a secret, Kakashi. How's your exam preparation going?"

As Furukawa Osamu asked questions, he jumped down from the tree branch. Kakashi, following behind, started complaining again when the Chunin Exams were mentioned:

"The captain didn't recommend me to participate in the joint exam; it was just an internal village selection."

"You know, ordinary genin can't keep up with me. I just don't want to do those boring D-rank missions anymore."

Seeing Kakashi shrugging, Furukawa Osamu shook his head slightly. Might Guy, who had overheard their conversation, perked up and excitedly asked:

"How did the C-rank mission go? Kakashi, how much reward did you get?"

"Ten thousand taels? I don't care about that. Most of the missions are guarding or intelligence gathering. It would be a bit difficult for Kai. I don't think you are good at infiltration operations."

With his hands in his pockets, Kakashi shrugged after saying this, clearly "getting revenge" for the "youthful blow" Might Guy had given him.

Everyone understood the underlying meaning in Kakashi's words, but Might Guy himself crossed his arms and fell into deep thought. After a while, he looked up and said:

"My transformation technique does still have some problems. If it's for infiltration commissions, I need to continue training."

"To get a C-rank mission as soon as possible, I need to complete 500 side kicks!"

"..."

Upon hearing the "Daily Youth Challenge," Obito Uchiha stiffly turned his head. He regretted coming to find Kakashi; he couldn't keep up with the others at all.

"Come fishing! I don't want Lin to go hungry."

Obito decisively changed the subject, loudly calling the group to the riverbank. In the distance, Nohara Rin and Shizune had just finished gathering some wild vegetables for today's "barbecue day" activity.

It was everyone's first time fishing, and after half a day, only Kakashi had a good catch.

Unexpectedly, he could also use the air force here. Feeling somewhat embarrassed, Furukawa Osamu ultimately chose the ninja method:

"Lightning Release: Earth Walk!"

"Hey?! You rascal..."

Amid Obito's exclamation, several fish surfaced simultaneously. Seeing Furukawa Osamu calmly walk over and collect the fish into a bucket, the hot-blooded Uchiha youth roared in anger:

"You're cheating again! Damn it, we agreed to settle this with a fishing game..."

"I see, so this is also a form of spiritual practice. Here I come!"

He casually tossed the fishing rod aside and rushed onto the water. Although he couldn't maintain his balance, he didn't sink immediately either.

Water splashed everywhere, and Obito shouted angrily from the shore, while Kakashi calmly left with his bucket after reeling in his catch; he had already obtained enough ingredients.

Although he didn't know the species of fish, it was meaty with few bones and very suitable for eating, so Matt Kai buried his head in it and ate heartily.

On the other side, Obito was still unhappy about losing the fishing duel and would complain every now and then.

"Kakashi, were the Chunin Exams difficult?"

Having a rare opportunity to spend time with the boy she admired, Rin Nohara took the initiative, her soft questioning making Obito choke on his grilled fish...

"The village's internal selection process shouldn't be that difficult; it places more emphasis on ninja qualities and personal abilities."

"Now that Jonin have many missions, more people need to take on the lower-level missions."

Kakashi seemed unconcerned about the promotion, and calmly offered an explanation, his unspoken confidence further provoking Obito.

"Kakashi is a guy with outstanding ninja talent. I wouldn't be surprised if he became a Jonin at the age of 12."

Furukawa Osamu smiled and praised, while Nohara Rin glanced at Kakashi with an unintentional look of admiration, causing Obito to shout loudly:

"What outstanding talent! As long as I can awaken the Sharingan, becoming a Jonin won't be a problem, and I can easily surpass this show-off."

"Kakashi has exceptional control over chakra."

Even the usually taciturn Shizune spoke up in praise. Furukawa Osamu nodded and, looking at the disgruntled Obito, explained simply:

"The amount of chakra that gathers and flows in the human body's meridian system is limited. In order to ensure life safety, the eight acupoints in the body are used to limit the flow."

"The strength of chakra that can be carried and encapsulated outside the human body is also limited, so extraction and control are extremely important."

"The Uchiha clan possesses a vast amount of chakra, and if it cannot be controlled precisely, it is difficult to unleash its full potential."

"..."

As Osamu Furukawa began his "lecture," explaining the "strength and weakness of ninjas" through the meridian system and chakra flow, Might Guy listened intently, while Kakashi seemed to be deep in thought.

The two girls had studied medical ninjutsu and had a general understanding of it, but Obito listened with a face full of question marks, holding the grilled fish with his eyes wide open, as if to say:

"What are you babbling about?"

"Kakashi's talent lies in his ability to instantly extract and precisely control a large amount of chakra. As he becomes a Jonin in the future, this talent will amplify the power of his ninjutsu."

Furukawa Osamu said nothing more, raised an eyebrow, and began to enjoy the delicious fish.

While these theories apply to all ninjas, there are always those who can break these inherent limitations.

The most prominent examples are Hashirama Senju, who possessed "Chaton," the Uchiha clan, who piloted "Gundam," and the prophesied child who frantically created Rasengan, among others...

"What?! Just let your body remember the feeling of fighting!"

Dizzy and confused, Obito loudly complained, pretending not to understand anything. Shizune chuckled softly, and even Rin Nohara smiled.

Kakashi noticed Obito grinning foolishly along with the girls, so he sighed dramatically, then shrugged and said:

"That's really tough on the team at the bottom!"

The two soon started arguing again, but Matt Kay was feeling rather heavy-hearted.

Involuntarily reflecting on his own limitations, Might Guy understood why his father didn't use forbidden techniques lightly; the damage was greater than he had anticipated.

-

At the end of September, the news of Kakashi Hatake's promotion to Chunin swept through the entire village, and even visiting merchants praised Konoha's genius boy.

As time went by, news of the 6-year-old Chunin spread far and wide, sparking a frenzy of diligent study at the Ninja Academy...

The Konoha leadership seems to be setting an example, as more and more teenagers are starting to clamor for early graduation.

Before afternoon classes began, homeroom teacher Ryosuke Kimura made sure to praise Kakashi again, and also announced to everyone:

"By this time next year, Xiu will not only graduate from the Ninja Academy, but will also be able to officially participate in the work of a medical ninja."

"After evaluation, Lady Tsunade gave extremely high praise to Xiu's recently improved soldier ration pills."

"..."

From military rations to missions and wars, Ryosuke Kimura got more and more excited as he talked, and for a while he couldn't stop.

Sitting in the front row by the window, Osamu Furukawa was lost in thought. Ever since he started using the essence to cultivate some herbs, his "pharmacology" experiments had been progressing by leaps and bounds.

However, after solving the alienation problem, another problem arose. Reflecting on the attempts of the past few days, Furukawa Osamu pondered to himself:

"Can I only use Sage Chakra for one minute...?"