Both time-traveled characters ended up as villainous henchmen.

Izumi Nen's mind was suddenly jolted.

He remembered that this space seemed to be a space for mental communication between Jinchuriki and Tailed Beasts. How did he get in?

Before he could figure it out, the Nine-Tailed Fox in the dark space seemed to sense something and slowly opened its eyes, revealing its scarlet vertical pupils.

Upon seeing this, Izumi Nen's mind suddenly clenched, but then the dark space in front of him quickly dissipated, and his spiritual will returned to his body.

Everything that had happened before seemed like an illusion.

Having experienced such a thrilling scene, Izumi Nen was deeply moved. It seemed that his Purple Nether Eyes possessed other abilities that he had not yet discovered.

Yin-style escape and mental power... also have a certain degree of invasiveness...

Izumi thought to himself, while simultaneously deactivating the Purple Nether Eye technique and glancing back at Minato and Kushina as they walked away.

"As expected, the world is different, and our data analysis and collection capabilities cannot be fully utilized. There are always some things that we have to experiment with ourselves..."

After silently sighing to himself, Izumi Nen stopped watching and turned to leave.

the other side.

In Kushina's special mental space.

Nine-Tailed Fox slowly raised its head and looked in the direction it sensed. It seemed to have noticed that someone was spying on it. However, when it followed the senses to search for the source, it found nothing, as if the previous senses were just an illusion.

Kurama didn't think much of it, but just roared angrily in a low voice, placing all the blame on Kushina and Mito Uzumaki, who sealed it away.

Kushina naturally noticed the strange movements of the Nine-Tails within her, but she didn't pay attention to it, taking it as just the Nine-Tails' daily erratic behavior.

……

Upon returning to Orochimaru's laboratory, Izumi Nen immediately went to his room, took out paper and pen, and recorded all the data he had previously observed from Kushina.

Although with his current mental strength, it wouldn't be difficult for him to have a photographic memory, he still prefers to actually list the data before doing further analysis.

Aside from the unexpected encounter with Kurama at the end, Izumi Nen's gains this time were quite good.

Although he only maintained the lowest power of his eye technique when facing Kushina and Minato, he still managed to collect a lot of useful data.

There was nothing unusual about the blood flow and nerve signals in Kushina's eyes and brain.

The real change is in the place where the Nine-Tailed Fox is sealed.

Izumi could sense that the Nine-Tails' seal had become a location on Kushina's body similar to a second heart and brain.

A large amount of blood and nerve signals are being transported to this area.

However, unlike the human heart and brain, which are the source of blood and nerve electrical signals.

The sealed area is where blood and nerve electrical signals converge.

The Four Symbols Seal not only sealed the Nine-Tails, but also used Kushina's power to maintain the strength of the seal.

Even this seal altered some of Kushina's physical structure to a certain extent.

"No wonder ordinary people are simply unable to take on the role of a Jinchūriki who seals a Tailed Beast. Under this level of consumption and absorption, it is almost impossible for someone with a weak physique and insufficient chakra to survive."

Izumi Nen sighed silently. With the help of the data he had observed and collected today, he had gained a clearer understanding of the application of the Four Symbols Seal on the Jinchuriki of the Tailed Beasts.

The Four Symbols Seal has many derivative uses, and has even given rise to other advanced sealing techniques. What Izumi Nen values ​​is the application of the Four Symbols Seal to the Jinchuriki of the Tailed Beasts.

That's right. The large-scale complex seal he designed for his own chakra meridian system, blood circulation system, and Sage Body was largely based on the sealing techniques of the Tailed Beast Jinchuriki.

Creating something out of nothing, establishing a system for chakra accumulation and training within the ninja world, is extremely difficult.

Why not emulate a similar model that already exists in the ninja world and upgrade it to suit his own needs?

The unique mode in the ninja world that allows individuals to possess an extra, enormous source of chakra within their bodies is the Jinchuriki, the tailed beast.

To be honest, this inspiration was largely thanks to Orochimaru.

Rather than taking the huge risk of sealing the tailed beast into one's body, it would be better to build a similar framework and then slowly fill it with chakra.

Not to mention that the power distribution of the nine tailed beasts in the ninja world is extremely unbalanced; one Nine-Tails could defeat all the others combined.

It's clear that the Six Paths Elder was biased when creating the Tailed Beasts.

This allocation pattern also greatly reduced Izumi Nen's interest in other tailed beasts besides Kurama.

Moreover, if he really wanted to deal with the Nine-Tails, Izumi Nen was very worried that at the last moment an old man from the Six Paths would suddenly appear and pull him into a dark room for a talk.

However, if it's just a portion of the Nine-Tails' chakra, it's much easier to manipulate.

However, that's not what Izumi Nen needs to do right now.

What he needs most right now is to perfect the circulation and integration of his Sage Body and the chakra power system within his body.

The fusion of Yin and Yang is the first step in this complex project.

"The advantages and disadvantages of the Four Symbols Seal are very obvious. The advantage is that the sealing strength is guaranteed to be sufficient, but the disadvantage is that it can only be used for sealing and cannot be used for more applications."

Izumi Nen picked up his pen and sketched out the basic framework of the Four Symbols Seal on the paper, but quickly drew an X next to it.

The Four Symbols Seal was not his final sealing technique choice, as its abilities were too limited.

Conversely, Minato Namikaze's later improvement on the Four Symbols Seal, the Eight Trigrams Seal, possessed greater versatility in application and was better suited to his needs.

It can not only be sealed and stored, but also transformed and utilized.

However, the Bagua Seal at this stage is most likely still only in Minato Namikaze's imagination. Even if he were to ask Minato Namikaze now, the latter probably wouldn't be able to give him a clear answer.

Therefore, to achieve the effect of the Bagua Seal, he needs to improve the Four Symbols Seal himself.

"I remember that in the setting, the Eight Trigrams Seal is composed of two nested sets of Four Symbols Seals, but the question is, how exactly are these nested seals arranged..."

Izumi Nen picked up his pen and scribbled on the paper, drawing several similar structures before quickly rejecting them.

Clearly, he wasn't very capable of researching and improving this traditional ninja sealing technique.

After a few attempts, Izumi Nen stopped worrying about it. Directly replicating Minato's Bagua Seal was too difficult, and even if he deduced it later, it would most likely not be the sealing technique that perfectly suited his situation as he had envisioned.

Therefore, he needs to improve upon the Four Symbols Seal to create a unique "Eight Trigrams Seal" that belongs to him.

The terms "Four Symbols" and "Eight Trigrams" are intertwined, and Izumi naturally thought of the Taoist knowledge shared by He Nian.

Taiji gives rise to Yin and Yang, Yin and Yang give rise to the Four Symbols, and the Four Symbols give rise to the Eight Trigrams.

The two sets of Four Symbols seals are superimposed and nested to form the Eight Trigrams seal, a concept that at first glance seems similar to the meaning of the Four Symbols generating the Eight Trigrams.

Although it may seem like just a similarity in numbers and nouns, the Naruto world has a certain mystical foundation.

If we start from the proper Tai Chi Bagua, it is not impossible to successfully create a completely new sealing technique.