Both time-traveled characters ended up as villainous henchmen.

Having thoroughly clarified his future path, Izumi Nen already had many ideas about what to do next.

First and foremost, it is the evolution of one's own immortal body and the fusion of Yin and Yang.

However, due to his sudden increase in Yin Release chakra, he is currently experiencing a temporary imbalance of Yin and Yang within his body.

To continue the fusion of Yin and Yang Release, we need to deal with this sudden increase in Yin Release chakra first.

Izumi Nen had already prepared a plan for this.

Sealing technique.

Using a sealing technique, the excess Yin Release chakra within his body that was affecting the fusion of Yin and Yang Release was temporarily sealed away. The seal would be released once the Yin and Yang Release fusion was complete.

By then, since the fusion of Yin and Yang Release will be complete, its chakra nature will no longer be as variable as it is now when it is still undefined, and its energy level will be stronger than that of Yin Release or Yang Release alone.

Even though the Yin Release within him overwhelmed the Yang Release, he was confident that he could use the Yin and Yang Release after the successful fusion to completely absorb and transform it, and restore the balance.

Based on this purpose, his Yin-Yang Escape fusion effect also had a general direction, namely the mutual transformation between Yin and Yang.

"I feel like I've added a lot more workload and difficulty to my job..."

Izumi Nen looked at the research directions he had listed on the paper and couldn't help but twitch the corners of his mouth.

Of course, he didn't object to it; on the contrary, he was quite enthusiastic about it.

Let's start with the sealing techniques for Yin Release chakra.

Izumi Nen was in high spirits and, taking advantage of his active mind, began to conceive his special Yin Release chakra sealing technique.

What he wanted was not a single Yin Release sealing technique, but a special application of Yin Release chakra that could be incorporated into his new chakra system in the future.

That's right, it's an application, not a simple seal.

Restraining the activity range of Yin Release chakra was only one of his objectives. More importantly, he wanted to use Yin Release chakra to allow himself to evolve accordingly.

He wanted to concentrate Yin Release chakra in his eyes and brain to create his own Sage Eyes!

Only those who possess both the body and eyes of a sage are qualified to be on par with the Otsutsuki clan.

Previously, Izumi Nen only shared Pikachu Nen's evolutionary power, and its effect was not as strong as expected. Therefore, this idea remained just a thought.

Now that the evolutionary power of Yaguni has been shared and superimposed, this lofty idea has the potential to become a reality.

Moreover, due to the evolution of the Dark Water Yin Escape technique, his precise control over blood has reached a new level.

Even the blood vessels in the eyes and brain can be precisely manipulated without causing damage.

"First, there's the simplest modification: the circulatory system. This requires transporting Yin Release chakra through the blood to slowly nourish the eyes and brain, allowing them to adapt and evolve. Then comes the connection between the meridian system, acupoints, and blood circulation..."

Izumi took out a brand new piece of white paper and, while writing, sketched a simple diagram of the human body on the paper, as well as the approximate meridian system and acupoint locations.

The meridian system is the pathway through which chakra flows within a ninja's body, while acupoints are the outlets on these meridian systems that extend throughout the ninja's body, used to release chakra.

The meridian system and acupoint locations of ninjas are basically fixed, making it too difficult to create new and varied sealing techniques based on this foundation.

But Izumi thought differently.

He can control the growth of his own blood vessels, and changing the location and direction of blood vessel flow is also easy for him.

Furthermore, since his Yin Release chakra can be stored in his blood, a completely new chakra "meridian system" has emerged, which he can control and master himself.

When another variable that can change freely is added to the two constant variables, the chakra meridian system, which originally seemed inflexible and lifeless, is revitalized.

Izumi picked up his pen and continued scribbling on the paper.

He separated the meridian system and acupoints of the head and eyes and drew them in more detail. After finishing, he took a different colored pencil to represent the circulatory system and began to further improve and supplement the original meridian system and acupoints.

Gradually, the blood circulation system that Izumi Nen re-added, together with the original chakra meridian system and acupoints, formed a unique, complex, and exquisite new sealing technique.

The most important part of a sealing technique is undoubtedly the sealing formula that carries the entire sealing technique.

The difficulty of drawing the sealing formula and precisely injecting chakra into it to make it function as required is no less than writing a large, complex program on one's own.

The sealing technique that Izumi Nen is currently drawing, which is composed of the chakra meridian system, acupoints, and blood circulation system, is even more difficult than ordinary high-level sealing techniques.

Given Izumi Nen's current knowledge and understanding of sealing techniques, it would be impossible for him to complete such a difficult and precise sealing technique.

But his knowledge comes from more than just the ninja world.

The meridian system in his personal world—another energy circulation system—provided him with great help.

In addition, and most importantly, was the Qimen Dunjia knowledge that He Nian shared with him.

With the knowledge of formations and Qimen Dunjia, Izumi Nen was able to create a completely new sealing technique.

By utilizing the circulatory system, chakra meridian system, and acupoints containing chakra with different properties, a simplified Qimen formation is set up. Finally, it is integrated into the sealing technique system of the Naruto world, making it a unique sealing technique that does not require inscription of sealing techniques.

The Qimen Dunjia mentioned here is not the famous Feng Hou Qimen or Wu Hou Qimen in the world of Qimen Dunjia, but the most basic and widely used common Qimen knowledge.

It may not be as powerful or effective as Feng Hou and Wu Hou, but it is precisely because of the commonality of this Qimen knowledge that it has the potential to be used in the Naruto world.

When Izumi Nen was watching the Naruto anime and manga, he had other associations with the words Yin and Yang, Four Symbols, Eight Trigrams, Immortals, and Five Elements mentioned in the work.

If it were just a work of art, the Chinese elements appearing in Naruto could be explained by the author borrowing from various sources. But now that Izumi Nen has actually traveled into the Naruto world, he is no longer facing a fictional work, but a real world.

So perhaps hidden beneath these words are secrets he has yet to discover.

To verify this, Izumi Nen would certainly not directly take action and use himself as a guinea pig.

He needs a preliminary experiment to verify it, and incidentally, he can also use "world" certification to fully realize this conjecture.

"A simplified idea for sealing spiritual energy in the eyes and brain."

Izumi Nen's lips gradually curved into a smile as he recalled Orochimaru's "you can't possibly achieve anything" expression.

"Perhaps you will soon see the results, Orochimaru-sensei."