Both time-traveled characters ended up as villainous henchmen.

"Are you trying to increase a ninja's chakra synthesis limit by separately storing sealed spiritual energy and physical energy?"

Orochimaru easily saw through Izumi Nen's thoughts.

To be honest, he had done similar experiments himself, but the results were not ideal.

While sealing techniques can indeed seal a ninja's body and soul, their effect on physical and mental energy is far beyond what ordinary sealing techniques can achieve.

Even with powerful sealing techniques, it is not easy to seal away physical and mental energy.

Either these physical and mental energies will be absorbed and assimilated by the sealing technique, or they will return to the ninja themselves under the pressure of the sealing technique.

Simply put, it can't be stored.

Sealing techniques inherently possess chakra, and chakra is a superior and overwhelming form of energy compared to physical and mental energy.

Physical and mental energy alone cannot compete with chakra.

Orochimaru once failed to master Sage Mode, which led him to research the two main sources of chakra.

But to be honest, he didn't achieve anything groundbreaking in the end.

He had no idea why the combination of physical and mental energy would produce chakra, a higher-level energy.

Orochimaru believed that there was a secret between physical energy, spiritual energy, and chakra that he could not fathom.

This secrecy governs the formation of chakra and establishes its overwhelming dominance over both.

Therefore, Orochimaru believed that Izumi Nen's idea had a huge flaw from the very beginning.

However, what made Orochimaru re-examine Izumi Nen was not the other party's careless stupidity.

Rather, it was the special sealing technique concept proposed by Izumi Nen in his experimental report.

The ninja's chakra meridian system, blood circulation, and even the hidden acupoints in the body are all incorporated into the sealing technique.

It is not simply about sealing physical and mental energy with sealing techniques, but about achieving the purpose of restraining physical and mental energy through the coordinated action of various parts of the body.

Unprecedented ideas and perspectives.

And, unprecedented greed.

"Don't you think Izumi-kun's sealing technique idea is too far-fetched and unrealistic?"

Orochimaru handed the experimental report back to Izumi Nen and continued, "Don't even mention you, even I myself couldn't handle the research of such a massive system."

The meridian system of ninjas is already very complex, and the addition of acupoints and the blood circulation system makes the complexity of this research subject increase exponentially.

This is without even mentioning the numerous problems and life-threatening situations that may arise during the research process.

Most importantly, this research is destined to involve a large number of human experiments.

Moreover, Orochimaru felt that expending so much effort just to seal and store physical and mental energy was going too far and putting the cart before the horse.

The ninja world values ​​chakra.

Compared to physical energy and mental energy, chakra is easier to seal and store, but this is only in comparison to physical energy and mental energy.

Chakra that has been separated from the original ninja meridian system and hand seal system will become very unstable.

If it's simply a matter of sealing chakra, then all that's needed is to increase the power of the sealing technique.

However, if you want to make more use of this sealed chakra, then simply sealing it won't work.

The nature and form of chakra, as well as the strength of sealing techniques, and even the methods and uses of their extraction are subject to strict requirements.

Tsunade's Yin Seal is an example of this; although it can store chakra, it also has many limitations.

Most importantly, the Yin Seal can only slow down aging, not bring true immortality.

Given Tsunade's high regard for him, Orochimaru didn't investigate further.

It is too difficult to improve a ninja's level by sealing their own chakra.

Unless it is a chakra aggregate with self-awareness and a stable existence—a tailed beast.

"If you really want to increase your chakra limit, why not consider becoming a Jinchūriki?"

Orochimaru, with a hint of dark thoughts, teased Izumi Nen.

As is well known, becoming a Jinchūriki often comes with great danger to one's life, not only to the Jinchūriki themselves, but also to the ninja who performs sealing techniques on them.

Moreover, not just any ninja can become a Jinchuriki; the requirements are extremely strict.

In Orochimaru's view, Izumi Nen already had the huge advantage of being a Sage Body, so it was absolutely crazy for him to take the risk of becoming a Jinchūriki.

Moreover, attempting to seize a tailed beast in this era would absolutely trigger a new ninja world war.

If Izumi Nen really listened to him and did such a thing... Orochimaru suddenly felt a little expectant.

Faced with Orochimaru's teasing reply, Izumi Nen was not annoyed, but instead showed curiosity about Jinchuriki.

Orochimaru did not hide anything from Izumi Nen and directly told him about the secrets of Jinchuriki, including Kushina Uzumaki from the village.

Although Izumi Nen already knew these things, he did not show it.

Finally, Orochimaru offered some advice regarding Izumi Nen's outrageous idea.

"Izumi-kun, you should start with the details, first combining the meridian system and blood circulation system in a small area, and then consider the whole."

Of course, the overall situation will likely be completely different from your small-scale research.

Orochimaru poured cold water on the idea, but did not directly ask Izumi Nen to give up.

He suddenly became very interested in seeing what Izumi Nen would eventually come up with.

After all, Hiruzen Sarutobi had shown him that special illusion technique when he returned that day.

This ingenious and unique idea also made Orochimaru take Izumi Nen's scientific research talent seriously.

Could it be that this ability is also a gift from the immortal body...?

After sending Izumi Nen away, Orochimaru went back to the laboratory and continued to work diligently.

Although Izumi Nen had been dealt a blow by Orochimaru, he was not angry. In fact, he had deliberately staged this whole performance.

The idea of ​​sealing away physical and mental energy is merely a prelude.

As for the complex sealing technique that Orochimaru criticized as overly ambitious, it was also a prelude and hint for his ultimate goal.

First, give him a vague goal, then make some achievements along that path, thereby continuously increasing Orochimaru's trust in his abilities.

Finally, as long as he exhibits some characteristics of ultimate success, those characteristics will become evidence confirming Orochimaru and others' inner suspicions. He can then use this "world certification" to piece together and achieve his true purpose step by step.

Izumi Nen did not intend to hide his true purpose in the same project. He planned to select different test subjects in batches for different tests, so as to eventually piece together the perfect immortal body he wanted!