Ruri went to the Hokage Building, and it didn't take long to return home again.

When he returned, Shiraishi saw Ruri holding a scroll in his hand and threw it to Shiraishi.

"Thanks."

Shiraishi was not pretentious, and directly caught the scroll.

"You just need to hurry up and study the immortal arts."

"This kind of thing is really a bit difficult, after all, there is too little information on immortal arts. Even if it is a reference, if there is an immortal system of the three holy places that can be studied, then it will undoubtedly be of great help to my work. ”

"Give it up, if you don't sign a psychic contract with the three holy places, it would be difficult to find there, let alone obtain immortal magic from there."

"In this way, Sanninja is really a unique ninja."

The Konoha Sannin has a close connection with the Three Holy Lands, and this kind of rumor has long been common.

Not only is he a disciple of the Hokage, but he also relies on the three holy places behind him, which is beyond the reach of ordinary ninjas for a lifetime.

"But even if it's the three ninjas, I haven't heard of them successfully cultivating immortal arts."

"Of course, I don't know if there is any difference between the immortal art cultivated by the psychic beast and the immortal art I studied, but the fusion of natural energy and ordinary chakra is indeed quite risky, and it will really kill people."

Shiraishi sat down in the room, took a sip of tea, and then spread out the scroll in his hand.

At the beginning of the scroll, the developer and name of the ninjutsu are recorded.

The art of spiritualization.

The developer of the previous generation of Hokage was between a thousand hands.

According to records, spiritualization is a technique that allows the soul to leave the body and travel regardless of distance, directly killing enemies.

However, after the soul is separated from the body, the spirit body will still retain the consciousness of the caster, so this ninjutsu has a wide range of uses, not only can be applied to combat, such as transmitting information, large-scale perception, and even transmitting chakra for companions, etc., all spiritual techniques can be done.

I have to say that the previous generation of Hokage-sama, who developed this ninjutsu, is a respectable figure.

I heard that it was sacrificed on the battlefield of the First Ninja World War, but it's a pity.

For many of the ideas of the previous Hokage, Shiraishi agrees with it very much.

Build a ninja school, set up a dark organization, divide and suppress the ninja clan, improve the status of civilians, and create various secret arts and ninjutsu belonging to the Konoha school...... He is a shadow of all the political, scientific, and military fields, and he was the first to create it, and it has been imitated by ninja villages in various countries.

The era of one country and one village was pioneered by the Senju clan and the Uchiha clan, but this system is actually just empty name and empty content...... If you think about it carefully, there is no difference from the war pattern of the ninja clan in the Warring States Period.

It wasn't until the previous Hokage came to power and carried out a series of epoch-making reforms that this deformed ninja ruling village pattern slowly changed to a better place, using the civilian class to contain the ninja class, and since then all parties in Konoha have formed a stable balance, containing each other and relying on each other.

The balancing act is self-explanatory.

The only pity is that there is no follow-up.

With the outbreak of the First Shinobi War, the previous Hokage passed away in a thousand hands, and even if he still had unfulfilled ambitions and ideals in his heart, he could only go with the wind and entrust the future of the village to the current three Hokage.

As for the three generations of Hokage, Shiraishi doesn't know a lot, and it may also be because the previous Hokage Zhuyu is in front, causing many people to ignore the actions of the three generations Hokage.

After all, many systems have been perfected during the previous Hokage period, resulting in future generations not being able to surpass the previous generations no matter what they do, so we can only look forward to what amazing things the three generations of Hokage will do in the future.

After thinking about this, Shiraishi returned to the underground laboratory with the scroll of the Spiritual Technique.

He had infused his subjects with natural energy, and it would take some time to observe and collect data.

So, it's time to think about the 'Caged Bird' spell sign.

As for the caged bird, Shiraishi has actually been studying it for some time, but due to the lack of data and the fact that the deeper structure of the chakra has not been fully resolved, progress in this area has stalled for a long time.

According to Ayane, once a caged bird is engraved, it follows a lifetime and is only eliminated when it dies.

In other words, the caged bird can be released with the condition of 'death'.

So, what kind of state of 'death' is death?

Body or soul?

What kind of characteristics is chakra endowed with in this?

People are born with chakra, and if you lose chakra, you die.

If Ayane is left in a state of chakra exhaustion and death, will the caged bird be eliminated?

Of course, this death is not a real death, but a state of suspended animation similar to death.

After that, she is repeatedly given Ayane Chakra to wake her up from suspended animation.

The premise of doing this experiment is to first verify a point of view.

That is, after the loss of the chakra...... Will it really die?

If a person loses chakra and does not necessarily die, then ...... How did the chakra come about?

Why has it become an essential energy source for human survival?

Is the death of losing Chakra a physical death or a soul death?

Can humans be allowed to lose the chakra and enter a wonderful state of suspended animation, and after being re-endowed with chakra, they can come back to life again? Can this be done?

If all of this can be confirmed experimentally, then eliminating caged birds is likely to be no longer a problem.

It also solved many doubts in Shiraishi's heart.

Shiraishi carefully recorded these guesses in the notebook he carried with him.

In science, you can only guess when you have doubts, and then you can prove whether it is right or wrong.

Therefore, the study of soul ninjutsu is necessary.

The only troublesome thing is that it is a time of war, and he may go out on a mission at any time, so there is no time to experiment here.

◎

Listening to the strange screams from the test subjects on the operating table, the pain was unbearable, and I couldn't make a sound when I wanted to scream, and I obviously felt that my voice was about to be shouted, but I could only hear the slight sound of myself struggling on the operating table.

Shiraishi calmly looked at the experimental subject who was desperately spasming his body on the operating table, his face was distorted and painful, there was no emotion in his eyes, and he skillfully moved on his arm, cutting off a piece of epidermis eroded by natural energy, the epidermis was a faint green, put it in a vessel, and observed it with a microscope.

Then, he looked at the light screen of the computer, which displayed the heartbeat rate of the subject on the operating table in time, and the fluctuation value generated by the fusion of natural energy and chakra.

These test subjects have gone from being uncooperative at the beginning to being played with by others, with numb expressions, and there is no fear in their eyes.

In this regard, Shiraishi said that it was a bit of a mistake.

I didn't expect that after the natural energy fused with the chakra in the human body, it would cause such a terrible mental and physical impact on the person concerned.

Therefore, whenever a subject's mind shows signs of collapse, the experiment is stopped in time, and a tranquilizer is prescribed to replace it with another subject.

This kind of repeated and sustainable use can also be regarded as saving costs.

Shiraishi looked at the other people who were shivering by the wall and shook his head, really, these guys don't have the spirit to dedicate themselves to science at all.

If his experiment can be successful, these people can suddenly change from ordinary people to ordinary people whose bodies are full of immortal chakra, although they don't know any ninjutsu, but their vitality, strength, speed, and reaction power will all be qualitatively improved.

Others dare not say that living a long life should not be a problem.

As for immortality...... Shiraishi thought about it helplessly, the more he thought about it, the more outrageous it became.

"The research of natural energy is basically almost here, and the Immortal Chakra needs to further deduce the data to improve the success rate of fusion, and then I can concentrate on dealing with the problem of the caged bird's curse mark......"

Well? Wait a minute!

Shiraishi suddenly discovers a very serious problem, that is, how can he collect detailed body data in Ayane's current state now.

He is currently living in the Uchiha clan, and Ayane is a ninja of the Hyuga clan.

If you bring Ayane over and accidentally find out by Ruri......

A trace of cold sweat unnaturally flowed from Shiraishi's face.

Hurry up and calculate, what is your survival rate after being discovered?