Teaching the Rasengan

How old can a ninja be at their peak? And how long can they maintain that peak?

Orochimaru was taken aback by the sudden question, then revealed a thoughtful and enigmatic smile.

"Ninjas are different from ordinary people. Chakra possesses the power to strengthen both the body and mind, and the amount of Chakra varies from person to person. However, if an ordinary ninja receives excellent Medical Ninja in the early stages, and their body is free of hidden injuries, their physical development will be complete by the age of 17-18. With the passage of time, their peak physical age is between 20 and 35 years old. The duration of this stage varies from person to person, as each ninja's constitution is different, the number of cell divisions is different, and the aging time is naturally different."

"Chakra is amazing. The difference in Chakra levels Genin and Jōnin results in vastly different effects on cell and body nourishment and strengthening. Therefore, a ninja's physique is determined by the amount of Chakra and their control. The greater the amount of Chakra, the stronger the body strengthening and the longer the peak period can be maintained. However, even with the same amount of Chakra, the strengthening effect on the body will differ, which is related to control."

"The so-called peak period is never a fixed number. High-intensity battles, even those that push the limits, will leave physical injuries. Some ninjas, due to hidden injuries, begin to experience a decline in physical functions around the age of thirty. Therefore, there is never a measurable data point for the peak. However, some powerful ninjas at the very top of the Shinobi World, those who can rival the Kage, such as the Third Hokage, with their enormous Chakra reserves and superb control, only reach their physical limits when they are nearly sixty years old. Within a few years, they will begin to decline, especially in terms of Chakra reserves, which will weaken first. This is the fragility of life."

It has to be said, this is what you call professional. With sound reasoning and evidence-based research, Orochimaru gave a very well-founded and perfect answer, especially considering his deep understanding of his teacher, the Third Hokage.

The Sannin were also disciples of the Hokage, so they were not lacking in Medical Ninja for care. Not to mention, Snake Uncle, as a researcher, was definitely skilled in Medical Ninjutsu, although he and the medical guru Tsunade pursued different fields of development.

Jiraiya's age was 50-51 when he appeared in the first Chunin Ninja Exams, and he was 54 when Shippuden. Who would dare say that Jiraiya had already started to decline at this time? Therefore, some powerful and experienced ninjas can maintain their peak age until they are over sixty years old due to the enhancement of their bodies by massive amounts of Chakra.

The Chakra to enhance physical abilities can be seen from both students at the Ninja Academy and ordinary citizens; even children who have refined their Chakra possess physical qualities far exceeding those of adult civilians.

A large amount of Chakra and the ability to control it are key, as are resources from childhood; both are indispensable. Fortunately, one of the Sannin's teammates was the strongest Medical Ninja in the Shinobi World.

Watching Orochimaru's analysis, Uchiha Yoru couldn't help but show a look of admiration. "See? That's what you call professional."

"Teacher, the relationship between the soul and the body is very subtle. The body is so fragile, yet it can imprison and protect the soul. However, the soul has a longer lifespan than the body. So where does the soul go after the body dies? Is the body protecting the soul? Or is the body merely a vessel? Therefore, I have to come to a conclusion: just how great are the drawbacks of the Corpse Reincarnation Technique?"

When Orochimaru heard his disciple suddenly question his most prized longevity Ninjutsu, a serious expression appeared on his face. Orochimaru licked his lips and gave a hoarse smile. "Lord Yoru, do you mean to say...?"

"There are too many secrets between the soul and the body. I believe we still have enough time. Before our bodies weaken, we should not try to manipulate our souls and bodies. After all, Forbidden Technique that play with the soul are called taboos. Even the former God of Shinobi World and the Second Hokage failed, didn't they?"

Uchiha Yoru exuded an air of wisdom and caution. Science requires bold exploration, but it also needs careful verification.

"Teacher, according to the family records, the Uzumaki Clan seems to have done considerable research on forbidden soul techniques. In fact, the Uzumaki Clan once had an S-rank Forbidden Technique that could summon the Shinigami by sacrificing one's own soul, allowing the Shinigami to reap and seal the enemy's soul. It seems that the Nine-Tails was sealed under such Forbidden Technique."

After talking for a while, he finally revealed his true intentions and got to the key issue: to prevent Orochimaru from reincarnating too early. After all, reincarnation is risky, and if there were no restrictions on reincarnation, would Orochimaru already consider it a success? Later, Orochimaru began to crazily greedily pursue a powerful body, such as the Sharingan.

What if the Corpse Reincarnation Technique remains in a flawed and incomplete stage, and yet research has somehow been conducted focusing on this very flaw?

Given the choice between a strong physique and immortality, Orochimaru would likely prioritize Eternal Life. Only after achieving his goal of eternal life would he have the endless years to research various powerful Kekkei Genkai.

"Summoning the Shinigami?" Orochimaru immediately lit up with excitement, as if he had discovered a new continent, after seeing Uchiha Yoru bring up the legacy of the Noble Houses Uchiha.

The Shinobi World is getting more and more interesting! There are even such amazing Ninjutsu. If it can summon the Shinigami, then what kind of life form is the Shinigami? Has the Shinigami achieved immortality? And does the so-called Shinigami truly live in the legendary Pure Land? And what about the souls of the dead?

With a multitude of questions arising from his scientifically inclined mind, Orochimaru licked his lips with an excited glint in his eyes. "Heh heh, perhaps after uncovering the secrets of the Shinigami, the mysterious gates to the soul will open."

The soul is too mysterious. Even Orochimaru is currently only a novice in exploring the concept of the soul. Why does the human body age and die? Does the soul age? Or does it not?

Seeing Orochimaru's interest piqued, Uchiha Yoru nodded firmly and said, "That's right. This Forbidden Technique is called 'Reaper Death Seal.' According to clan records, this Ninjutsu is Forbidden Technique of the Uzumaki Clan. After the destruction of the Land of Whirlpools, this Ninjutsu ended up in Konoha."

"The Reaper Death Seal!" Orochimaru muttered to himself, seemingly able to accelerate his research into this mysterious Ninjutsu that already existed.

"It seems this was brought back from Kushina's time. I didn't expect the Third Hokage Kushina to have such a hidden trick up his sleeve. The Fourth Hokage actually used this Forbidden Technique to seal the Nine-Tails!"

After realizing something, Orochimaru narrowed his eyes, revealing a dangerous look. There was such a dangerous Forbidden Technique in the village, yet he knew nothing about it. Moreover, the Fourth Hokage Minato, Minato, knew this Ninjutsu, which meant that Jiraiya. But he, as one of the Sannin, did not know it. For a moment, his heart was filled with complicated emotions.

"When did you begin to be wary of your disciples, Third Hokage?"

It was clearly a sad event, but Orochimaru showed no trace of sorrow; instead, he exuded a chilling aura.

In the original story, Orochimaru was clearly unaware that the Third Hokage used the Reaper Death Seal during the Ninjutsu Chunin Ninja Exams. Orochimaru's Living Corpse Reincarnation clearly involves the soul, but having almost no clue about soul Ninjutsu, he had to start from scratch.

By letting Orochimaru know about the existence of soul Ninjutsu in advance, it's clear that Orochimaru, who is currently researching the Corpse Reincarnation Technique and pursuing Eternal Life, will naturally seek out related Ninjutsu.

After all, he had no clue before, but he could still follow his own ideas. Now that someone has pointed out a path for him, how could a scientist with an exploratory spirit suppress his thirst for knowledge?

"Teacher, given your current situation, it's probably very difficult for you to even touch this S-rank Forbidden Technique."

He was the one who gave the direction, yet now he's saying this. However, Orochimaru wasn't stumped by this little difficulty and immediately revealed a hoarse smile.

"Hehe, Lord Yoru, your information is very valuable. As expected of the oldest Kekkei Genkai families, the Uchiha and Hyuga clans are probably the only two clans in the entire Shinobi World with a long history."

Orochimaru attributed all of this to the long history of his clan, which allowed them to know these secret Forbidden Technique. It made sense that when members of the Uzumaki Clan appeared in Konoha, they would naturally attract attention.

"However, Lord Yoru, you should know one thing: this place was once the site of the Land of Whirlpools. Perhaps we can find some secrets about what you mentioned. It seems that the sealing techniques of the Uzumaki Clan hold many secrets."

At this moment, Orochimaru licked his scarlet tongue, revealing a dangerous and excited look. Seeing this, Uchiha Yoru secretly breathed a sigh of relief. He had finally found something for Snake Uncle to do. He didn't believe that Orochimaru could improve his Ninjutsu so quickly after adding another technique to the Living Corpse Reincarnation Ninjutsu.

After all, Orochimaru's physical abilities are now at least on par with Jiraiya's; both are Ninjutsu with massive Chakra reserves who can maintain their peak condition even in their fifties.

With this new direction, Orochimaru's Corpse Reincarnation Technique will likely be delayed, as the addition of a new research focus is intolerable for scientists who strive for perfect Ninjutsu.

"Lord Yoru, I will be investigating the secrets of the Uzumaki Clan in the Land of Whirlpools during this time."

A hoarse, sinister laugh echoed through the damp forest, and Orochimaru's body slowly turned into a puddle of mud and disappeared before their eyes.

Seeing this, Uchiha Yoru couldn't help but secretly admire the skill of this Mud Clone; he was still far from being at the level of the Sannin.

However, he had achieved his goal: delaying the development of the Corpse Reincarnation Technique. This meant Orochimaru wouldn't easily focus on the Sharingan.

After all, Orochimaru currently in his prime and has no rush. He will only start to worry when he reaches the age of the Third Hokage and his body begins to weaken. Even if the Corpse Reincarnation Technique is not yet perfected, Orochimaru will probably use it to restore his youthful body first.

The Land of Whirlpools, the Konoha Base.

The dense ancient jungle felt like a world of giants, but the people of the Shinobi World were already used to it. Each ninja hid in the trees like a small bird, cautiously and vigilantly searching.

The hill behind the mine.

Amidst the echoing sound of the waterfall, three tall ninjas were panting heavily as they practiced some kind of Ninjutsu.

The three women, Uzuki Yugao, Yūhi Kurenai, and Mitarashi Anko, were panting heavily, sweat beading on their noses, and their flushed faces showed the intensity of their training.

The three women exchanged glances, creating a distinctly eerie atmosphere.

Yūhi Kurenai secretly harbored a strong resentment. This Yugao was so shameless at such a young age, even becoming a mistress just to marry into Noble Houses. After all, nothing stays hidden forever, and Jōnin's keen observation skills and Yugao's lack of deliberate concealment, things were different.

A pang of bitterness welled up in her heart, and the sight of the sickly look hidden deep within Anko's eyes made Yūhi Kurenai feel a pang of sadness. But then she thought of herself and couldn't help but give a self-deprecating bitter laugh. What right did she have to look down on others? After all, her purpose in approaching Yoru was no longer pure.

"Hong, you're distracted!"

At the sound of a soft shout, Yūhi Kurenai quickly snapped back to reality. Looking at the figure, she composed herself and said, "Yoru, I'm sorry."

Seeing Yūhi Kurenai's apology, Uchiha Yoru's face hardened, and he said in a deep voice, "Kurenai, distraction is fatal for a ninja. Have you forgotten even the most basic things at the Ninja Academy?!"

Faced with Uchiha Yoru's stern reprimand, Yūhi Kurenai quickly composed herself. Although she was scolded, her heart was warmed.

Seeing that Yūhi Kurenai understood the fatal consequences of distraction, Uchiha Yoru's tense face gradually softened, but he still didn't look pleased. He said in a deep voice, "Kurenai, Genjutsu uses Chakra combined with mental power to interfere with the opponent's five senses, disrupt their Chakra, and cause them to fall into an illusion."

"Your family's Genjutsu is quite good, but your weakness is also obvious: your methods are limited. So you should work on your dodging (Taijutsu) skills. I will teach you a no-seal A-Rank Ninjutsu, but I hope you won't need it."

When Uchiha Yoru heard that Yūhi Kurenai was going to teach her an A-rank, no-seal Ninjutsu, her heart skipped a beat, but her face showed a solemn expression.

"Night, unless you created it yourself, it's not A-Rank Ninjutsu."

The importance of A-Rank Ninjutsu is self-evident; even for Jōnin, it is an extremely precious skill. Under the unseen gaze of Uchiha Yoru, Yūhi Kurenai's solemn expression revealed another side of her.

With provocative crimson eyes fixed on the two, Uzuki Yugao lowered her head with a humble expression. After all, her status as a lover on the surface was indeed not good. But in her heart, she was secretly competing with the vixen. What was she so smug about?

When Mitarashi Anko saw that her best friend Yūhi Kurenai's eyes seemed to be asserting her dominance, she immediately showed her cute little tiger teeth and grinned. She then went up to Uchiha Yoru and clung to his arm in a haughty manner, her beautiful eyes revealing a possessive desire that was almost obsessive, while she pretended to be pitiful.

"Night, you said you wouldn't give up on me."

Seeing Anko's pitiful appearance, Uchiha Yoruro troubled. Feeling the surging energy in his arm that didn't belong to her age, he still said in a deep voice, "Anko, put away your playful nature. I will teach you this Ninjutsu as well, and you will too, Yugao."

"I intend to teach this unmarked A-Rank Ninjutsu to the three of you; consider it an Ultimate Technique, ultimate technique for you."

Looking at the three women, Uchiha Yoruro serious. However, just as Uchiha Yoru turned around to move some things, the three women's eyes met instantly.

Uzuki Yugao's identity made her feign weakness, while her two best friends, Yūhi Kurenai and Mitarashi Anko, seemed to have become like plastic sisters at this moment.

"Anko, I remember you really loved to play back in school."

Yūhi Kurenai seemed to be implying something, saying, "Is it fun being a tomboy like you?" Mitarashi Anko grinned, revealing her cute little fangs, like a wild little cat baring its teeth, and said defiantly, "Kurenai-neechan, I like to play now too, especially playing with Yoru at home. By the way, I've moved into Yoru's house, and we play every night after dark."

Good heavens, Mitarashi Anko's personality has a wild side, directly challenging the two of them to a duel, not even sparing her former best friend Yūhi Kurenai.

Hmph! Anyway, it was Yoru who took the initiative to approach me, and Yoru broke up with you. Yoru is mine, and no one can take her away. Looking at Yūhi Kurenai and Uzuki Yugao, Mitarashi Anko was like a little wildcat, extremely attached to her current home and didn't want anyone to take away her master.

However, when she saw Uzuki Yugao, Mitarashi Anko couldn't help but frown slightly. Although she was wild, she wasn't stupid. With the caution of a ninja, she had long since noticed the relationship between the two, and she felt a pang of sadness, as if her toy had been taken away.

However, when she thought of Uchiha Yoru's identity, Mitarashi Anko's eyes revealed a morbid possessiveness: the Uchiha Noble Houses!

Previously, her status was a good match, but now! Thinking of this, Mitarashi Anko suddenly revealed a sickly smile, looking at Uzuki Yugao and laughing, "Yugao- neechan, your Wind Release and my Fire Style, from now on we'll stand together behind the night."

Since Uzuki Yugao was already one of their own, and she was a commoner and her lover, practically a little sister, Mitarashi Anko immediately decided to bring her to her side.

The three women exuded an eerie and dangerous aura. Yūhi Kurenai, who had gradually matured and developed a mature and alluring charm, revealed a dangerous glint in her crimson eyes.

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