In the ninja world, there are countless examples of ninjas who died as a result of chakra exhaustion due to battles.

Therefore, chakra can be regarded as an energy element that the human body must have when carrying out life activities.

If this energy is lost, the human body will stop functioning and fall into a state of death.

Although there are many causes of human death, the state of exhaustion is the most special type of death that Shiraishi considers.

Although the mystery has not yet been solved, the results of the experiment have been unexpected, opening a mysterious door to nowhere.

The vitality potion fused with natural energy was accidentally injected into an experimental mouse, and after draining the chakra in the mouse's body, it temporarily replaced the chakra's life energy status, and maintained the operation of life activities for a certain period of time.

Whether it is special in individual cases or can be universally applied, Shiraishi immediately launched a new experiment.

Take out all twenty mice again, inject them with the same vitality potion, and then extract the chakra from their bodies and place them in the glass cover for observation.

Shiraishi saw sixteen mice die in the glass enclosure after draining the chakra, even though they had vitality potions as an energy supply.

Of the remaining four mice, one of them had weak limbs and lay on the ground with his eyes closed, and it didn't take long for him to lie still and lose his life.

The second mouse reacted similarly to the first, only holding on for more than a dozen seconds than the first, and then fell there motionless.

Then it was the turn of the third, which was in good health, and did not show signs of weakening breath because of the loss of chakra, but was alive and kicking in the glass cover.

The change in the fourth mouse surprised Shiraishi even more, after the mouse took the vitality potion, its body was actually huge, and its eyes became more bright red, giving people a very dangerous feeling.

"It's ......"

One of the subject's assistants looked surprised, staring at the mutated mouse without blinking.

"I didn't expect the vitality potion to be of such use, it's like taking an energy hormone that suits you and stimulating the potential hidden in your body."

Shiraishi gave an objective evaluation.

The fourth mouse had apparently begun to mutate in an unknown direction.

And with this mutation, even Shiraishi can't predict how it will end.

Shiraishi set his eyes on the third mouse again, and the originally energetic mouse suddenly entered a weakened state, and like the first two pigs, he lay motionless in the glass cover and died.

Shiraishi opened the glass cover, took out the only surviving and mutated mouse, and held it in his hand to observe.

Shiraishi sensed it a little and found that the body of this little mouse was filled with incomparably vigorous natural energy.

Although there is no guarantee that it will be placed for a long time, it will not suddenly weaken and die like other mice, but for now, this mouse's life energy is very abundant, and there is no sign of vitality failure.

Moreover, through the experiment just now, it has also been proved that chakra can indeed be replaced by other energy as the energy source to supply life activities.

This supply energy is related to natural energy.

But there is also a problem, that is, in the past, Shiraishi directly used natural energy to replace chakra as a supply energy for life activities, but it led to the death of all the mice used in the experiment.

However, after being specially processed and blended into a vitality potion, it can provide life activity energy for living beings.

The loss of chakra also allowed the human body to carry out vital activities, and the results of this experiment were successful.

The only thing that Shiraishi didn't quite understand was why the original natural energy could not be used as a life energy supply, but the fire potion after multiple processing could do this.

Returning to the essence of the problem, after the loss of chakra, the human body's vital activities will stop, and the natural energy after special processing can be replaced.

Chakra does not come from the outside world, but is based on the combination of physical and spiritual energy of the human body, and it can be said that it is also the product of the processing of the 'factory' of the human body.

The fact that the experiment was correct was indeed a pleasure for Shiraishi.

It also means that the process of breaking the caged bird is one step faster.

However, the connection between chakra and natural energy makes Shiraishi even more inexplicable.

When the two energies are put together and compared, there is an indescribable sense of disobedience.

"I always feel that there is a very important thing missing here, and only by finding this thing will all the problems of chakra and natural energy be solved."

But unfortunately, what exactly is this 'thing' and the answer to the question is placed there, and Shiraishi has no clue at all, so he can only think about it here and keep finding other ways to prove the existence of that 'thing'.

◎

Since then, Shiraishi has been committed to the research of natural energy to replace chakra and supply the human body's vital activities.

If this experiment was just an illusory speculation before, after the unexpected discovery that day, Shiraishi can be sure that it is very feasible for natural energy to replace chakra and provide the necessary energy for life activities to the human body.

Since the operation of the experiment itself was not difficult, Shiraishi handed over the experiment to the five test subject assistants as usual, who were responsible for recording the detailed process of the experiment.

Shiraishi himself continued to practice the art of spiritualization, and further mastered the ability to change the nature of the Yin Attribute Chakra.

Before you know it, it's the end of August, and the weather is getting hotter.

It's been almost a month since I returned to Konoha.

This month has passed, and during this period, the three of Shiraishi have also exchanged letters with the captain of the front-line mission, Hachiki Shuomao, to learn about the current situation of the two sides.

What Shuo Mao learned was that the three of Shiraishi were unexpectedly calculated by the Sand Shinobi, and the three of them managed to escape from the Sand Shinobi's trap after an extremely tragic battle.

But after escaping, the three of them need to return to Konoha for two months due to their injuries.

As for the rest, it is not a word.

And in the letters sent back by Shuo Mao, most of them were concerned about their words, and the task he was responsible for was completed very smoothly, successfully destroying an important stronghold in the sand, and recovering some advantages for the Konoha ninjas on the front line.

At present, the morale of the Konoha ninjas on the front line is slowly rising, while the Sand Hidden side is a little powerless in the future.

It is believed that it will not be long before Konoha and Sagakure will sit together to negotiate and end this war in a peaceful way, drawing a perfect end to the war that will last for several years.

Although Shuo Mao tried his best to make the situation on the front line as relaxed as possible, the three of them knew that this was just Shuo Mao's words of comfort, and the situation on the front line did not allow for optimism at all.

But as long as they saw that Shuo Mao was fine, the three of them would be relieved.

◎

"The village is a lot more deserted than before."

After eating at noon, he went out with Ruri, and strolled through the streets of Konoha with her, and found that the crowd was much thinner than usual, and Shiraishi sighed.

Most of this has to do with the war ahead.

Konoha has experienced two wars in a row, Yuyin and Sand Hide, and the war with Yuyin, although Konoha won the final victory, but because of this, its vitality was damaged, and it took time to recover and develop.

However, it didn't take long for Konoha to recover, and in this weak and extremely slacked spirit, Sand Yin came to stir up trouble, causing Konoha to hurry up to fight.

In the battle with Sha Yin, both sides have won and lost, and they have been in a stalemate until now, and they have not played a satisfactory result.

Sand Hide wants to plunder as many resources as possible within the Fire Nation and use them to develop himself.

Konoha hopes to put pressure on Shagakure from the front, forcing him to sign a peace treaty and end the war.

It's an unsolvable question, and we can only see who can't hold it up first.

For Baishi's feelings, Liuli didn't take it to heart.

"How's the work?"

These days, Shiraishi has been soaking in the laboratory, rarely showing his head outside, and only comes out when he is eating.

During the day, Liuli also has her own things to do, and basically has no time to ask about the situation on the white stone side.

Shiraishi knew that Liuli was referring to the study of immortal arts, so he replied: "The success rate has increased a bit, but the risk has not been ruled out. If you use it rashly, it will be the same as you were the day. ”

Ruri nodded.

On that day, she forcibly fused the chakra in her body with natural energy to form an immortal chakra, which was used to increase the power of the fire escape technique, and it seemed to be successful, but after that, the problem appeared.

The immortal chakra in her body began to riot, and her consciousness fell into a severe coma, if it wasn't for Shiraishi's timely operation, it would be more than lucky.

Therefore, the immortal art in that state can be said to be a failure, and cannot be regarded as an example of success.

However, recalling the incomparably powerful feeling in his body after fusing the Immortal Chakra that day, Liuli had a very strong desire in his heart.

The power of immortal art is extraordinary, as can be seen from the day when the immortal chakra was used to release the fire escape, immortal magic can make a ninja completely reborn, and the strength can grow by leaps and bounds.

The most important thing is that her current writing wheel eye has opened to the three-hook jade form, reaching the peak of ordinary writing wheel eyes, and has basically lost the possibility of continuing to become stronger.

There are two paths to take.

One way is to obtain a method from the Elders of the Four Directions to open a higher level kaleidoscope writing wheel eye, and further sublimate the power of the writing wheel eye.

The other way is immortalism.

And immortal art is more focused in Liuli's eyes.

Because Liuli does not have an intuitive understanding of the power of the kaleidoscope writing wheel, but the immortal art is a powerful one that she personally feels.

Moreover, the person who once defeated Madara Uchiha, the owner of the Kaleidoscope Sharingan, was none other than the original Hokage.

Among the stunts of the first Hokage, in addition to Mu Dun, there is a mysterious immortal technique.

Immortal art is definitely a powerful force that is not far behind the kaleidoscope writing wheel eye.

Although Ruri was very eager, she also knew that it was not so easy to overcome the immortal arts, so she never urged Shiraishi to avoid putting too much pressure on him.

"Let's go over there, I'd like to buy some clothes."

"Okay."

Shiraishi has nothing to buy, all with the meaning of glass.

It is a rather traditional clothing store that has a good reputation in Konoha.

When Shiraishi walked in with Ruri, he accidentally found an acquaintance.

"Uchiha...... And Chiba-san? ”

Wearing a Konoha ninja forehead guard, a man in his twenties, looked at Shiraishi and Ruri who walked into the clothing store with a stunned expression.

"Fujimura-sensei?"

Shiraishi also recognized the identity of the man, who was his homeroom teacher from the first grade until the end of the sixth grade, Taiga Fujimura.

I didn't expect to run into it here.

"Are you the owner of this shop, Nakashinobu Fujimura-sensei?"

Ruri looked at Fujimura with a scrutinizing expression.

The corner of Mr. Fujimura's mouth twitched, the teacher is the teacher, why did you deliberately add a middle ninja prefix?

"No, it's not, it's actually ......"

Mr. Fujimura picked his face, and his face was a little embarrassed.

“…… This is my girlfriend's shop, she is out temporarily, I will help her take a look. ”

"It turns out that Mr. Nakashinobi Fujimura will also have a girlfriend."

Shiraishi touched his chin and looked like he was thinking seriously.

“……”

What is this, does the woman sing with the husband? Fujimura complained in his heart.

"Then again, how did you two end up in the village? I remember that your lead teacher was Shinobu Hagigami ......"

"Ah, because of some accidents, we are currently on vacation in the village."

"Really?"

Fujimura didn't care, and began to introduce the clothes in the store to the Shiraishi duo.

Inside this clothing store, there are a wide variety of clothes, ninja costumes, yukatas, casual clothes, sportswear, etc.

In addition, there are many accessories, such as ornate masks and earrings, which look very eye-catching.

"Well, the clothes here are all good, aren't they?"

Fujimura said happily.

"So-so."

Liuli said this, but her eyes were fixed on a piece of clothing.

It was a kimono that was very satisfying to her in terms of style and color.

As for the price, it was not in her consideration.

Shiraishi also saw this kimono and said with a smile: "Speaking of which, Ruri, I haven't given you many gifts over the years, if you like it, I'll buy it for you." ”

Because the cost of research and accommodation is provided by Ruri, there are very few places to spend money in Shiraishi, and the cost of the task saved is more than enough to buy such a kimono.

And after Shiraishi said this, Liuli's face, which was originally calm and unstable, was dyed with a layer of red at an astonishing speed.

Fujimura saw Shiraishi, who was blushing from Ruri's face on the side, sighed and said, "Chiba-san, you can't give a kimono away casually. For girls, a boy giving this kind of dress means proposing. ”

"Huh?"

Shiraishi's body stiffened, and he felt ...... Murderous!