After Naruto

"Six Paths Immortal" World looked at the book in his hand carefully with doubts in his heart, and then asked and answered to himself: "In the Six Paths Immortal period, the author of this book lived in an era that was too long ago, like this Can a paper book really be kept for such a long time? No!" He opened his Sharingan and prepared to explore the world, but was shocked by the microscopic form of this book. The material of this book is beyond the scope of the world's knowledge. It is neither animal skin nor plant fiber. Although the pages look like they are made of plant fibers to the naked eye, under the microscopic vision of the Sharingan, these are all disguises.

"Let me see what this is made of." Shijie pinched a corner of the page with his fingers, preparing to tear off a bit for study. But no matter how hard the world tries, it just can’t be torn off. It seems that I am obsessed with this book, and I feel that I must tear out a piece of it.

"Hu~hu~", the exhausted world lay on the floor. Well, she admitted, there was nothing she could do about the book. However, just because you can't do anything about it now doesn't mean you can't do anything about it in the future. "Well, I'll let you go first," Shijie said secretly, looking at the book in his hand.

Wiping the slight sweat from his forehead, the world returned to its previous state of mind. The book says that humans have a total life span of 800 years, but this is only a theoretical limit. In reality, humans cannot live that long due to natural and man-made disasters. Among them, the remaining life span of human beings in reality is probably only half of the original, that is, four hundred years. The ninja, through the circulation of chakra, has established a life circulation system in the body. This circulatory system is very powerful. The external force of chakra itself can avoid natural disasters, and external toxic substances and microbial parasites that can damage the body can be eliminated by relying on the internal force of chakra. Therefore, as long as the ninja is not killed by others, there is no problem in living to the end of his life and living a theoretical life.

"Half life?" The world couldn't help but think of the residents of the Fire Nation's capital. If you want to conduct a survey on the current maximum life span of human beings, then the old people in the capital of the Kingdom of Fire are the best subjects. Although six years have passed, the world still has a deep impression of the capital of the Fire Nation. After all, this is the place where the world's first mission was taken. In the impression of the world, the living conditions of the residents in the capital are still acceptable. Although very old people can be seen everywhere, there are still quite a lot of them.

Well, taking the old man in the capital of the Fire Nation as an example, humans without chakra can live up to about seventy years old in natural life. From this, the world uses the theory in this book to infer that a ninja with chakra to protect himself can live to be one hundred and forty years old, limited to the number of cell divisions.

This conclusion is a bit surprising to the world, but if you think about it carefully, there is nothing surprising. In the book, there is another theory that the world is more concerned about.

Generally speaking, the flow speed of chakra in a ninja's body is equivalent to the flow speed of blood, and the blood flow speed of a ninja is no different from that of ordinary people. However, unlike ordinary people, ninjas can speed up the metabolism of the human body by regulating the flow of chakra in the body. Moreover, while the injured ninja quickly recovers from his injuries, his chakra will also increase in direct proportion to the accelerated speed. And this approach is no problem for a world that has already developed half of the blood inheritance limit. However, the essence of speeding up metabolism is to sacrifice the inherent life of the human body. It can be said that this is exchanging one's own limited future. Of course, this is not a reason for the world to resist. After all, speeding up metabolism only requires food to keep up with it.

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Actually, you won't lose much chakra. However, in the eyes of the world, life can be measured in more than just chakra.

"Huh~~" Shishiji breathed out a deep breath and looked at the sky outside the window. I saw that the sun had already passed the center. According to the world's own inference, it was probably about three o'clock in the afternoon. Ever since, the world has put together this over 800 pages of medical basics. "Is it already this time?" Shijie was a little surprised at how quickly time passed. Then he looked at the book in his hand and continued, "It's time to return this book."

"Kurino-chan, I'm here to return the book." Outside the door of the medical examination room, Sekai shook the book in his hand at Uchiha Kurino.

"Hey~Sekai-chan, are you convinced so quickly?" Uchiha Kurino looked very surprised.

"Hmm~, watch it." Shijie said with a matter-of-fact expression: "I have the Sharingan eye, so I can quickly record the contents of the book."

"Huh~" Uchiha Kurino exhaled, took the book from Sekai's hand, and said, "Sekai-chan surprised me. I thought you understood the content of this book so quickly."

"I understand, is this difficult?" Shijie asked with a confused look on his face.

"Hey~~~" Kurino only felt that she had been hurt ten thousand times, and her whole body was in bad shape. "The text in this book is written in ninja characters. Many terms in it look like professional terms. Can you understand this?"

"Uh~", the world was stunned when he heard the words, and then opened the medical foundation in his hand and saw that it was indeed as Kurino said, all written in ninja characters. And for those nouns that look like professional terms, the world can easily tell their pronunciation and meaning without hesitation.

Suddenly, this matter began to reveal a hint of weirdness.

Ninja writing is the civilization brought by Kaguya from the planet Otsutsuki. The original ninja writing came from the Otsutsuki clan's exploration of runes. It has always been the basis for the sealing technique used by the Otsutsuki clan. In order to cope with the Otsutsuki people's need for written communication, this kind of rune was used in daily life. And, as time goes by, this writing system becomes stronger and stronger. In some respects, it can match the number of Chinese characters. In the real world of China, there are approximately more than 90,000 Chinese characters, and more than 7,000 are commonly used. It can be said that the complexity of the writing system of the Otsutsuki clan far surpasses the Japanese writing system of the human Hokage on Earth.

Of course, this is not difficult. What is really difficult is that the Six Paths Sage Otsutsuki Hagoromo once destroyed many books written by Kaguya in ninja characters. This is not only a gap in the use of chakra, but also a gap in the spread of words. It can be said that even the Sage of Six Paths has not learned all the ninja characters. Among all the ninja characters that exist today, it is estimated that only the "Uzumaki" and "Libra" families have the best preservation.

Of course, the world knows nothing about what happened during the Six Paths Sage. However, it is indeed a bit weird that I strangely recognize ninja characters that I have never learned.

"Kurino-chan, then it's better to leave this book here first. I can translate the contents of this book into ordinary characters. In this case, can't all of you read it?" The world leaves no trace Take back the medical foundation and say.