On the morning of September 1, the forty-second year of Konoha.

From early in the morning, the rain began to pour down incessantly.

In the white rain and mist, the fire shadow Yan Yan on the distant rock wall seemed to be draped in a light veil, looking hazy and looming.

There are not many pedestrians on the streets, but their faces are full of hope and vitality.

It has been two years since the end of the Second Shinobi War, and people have gradually hidden the pain caused by the war in their hearts, and they have gathered their hearts to welcome the arrival of a new life.

"I haven't been back for a few years, and it seems that the village is recovering well."

A teenager in a black ninja costume strolls leisurely down the street, holding a string of tricolored balls in his hand as he walks and eats.

He looked to be only fifteen or sixteen years old, with messy silver curls, delicate features but a slight hint of laziness, and a forehead guard on his forehead that symbolized his status as a Konoha ninja.

Although he didn't have an umbrella, there was no trace of him being wet by the rain, which added a touch of mystery to him.

The boy's name is Yusheng Natsuhiko, who has just been promoted to a special ninja, and has not returned to Konoha for a long time due to the need to stay outside for a long time due to the mission.

When he returned to Konoha this time, he actually had an important task on his shoulders.

That is to serve as the sealing teacher of the new semester of the ninja school.

"I didn't expect it to go so smoothly, not long after I submitted the application, the transfer paperwork came, and I didn't even need an interview."

Xia Yan was in a good mood, humming softly in his mouth, and his steps were extremely brisk.

In fact, he had applied for this position several times before, but unfortunately the school would reject him every time on the grounds that he was too young.

Xia Yan is not happy about this.

Children as young as five or six years old can go to war, but what about being a teacher at the age of sixteen?

You must know that he can become a special ninja, relying on his attainments in sealing techniques.

But this time it was a success, and it seemed that the village had finally recognized his strength.

Thinking of this, Xia Yan couldn't help but laugh at himself.

Perhaps in the eyes of many people, he became a special ninja at the age of sixteen, and he is the rising star of Konoha.

But Xia Yan himself knows it.

Compared to those three-year-old shinobi, five-year-old ninja, and less than ten years old, he achieved six realms, and by the way, Kaguya took maternity leave, his achievements are not worth mentioning.

Even Naruto Uzumaki, the protagonist of the original work, was only sixteen years old when he became a sixth-level powerhouse.

Sure enough, people and people cannot be generalized.

Alas!

Who made him a low-profile version of the traverser with no plug-ins, no special bloodline, and mediocre talent?

To be honest, Xia Yan can now become a special ninja, which can be regarded as an extraordinary performance.

You must know that when he was in ninja school, he even considered whether to give up ninja and become a chef and drop out of school to become a ramen apprentice, so that at least he could survive until the finale.

He was able to have the strength he has today, thanks to good luck, and was assigned to the sealing class after graduation.

Because there, Natsuhiko got a valuable opportunity to learn the art of sealing.

The so-called sealing technique is a special ninjutsu that uses rune techniques to restrict the opponent's chakra, block the opponent's actions, and even reduce the dimensionality of things.

Although the sealing technique is not as cool as ordinary ninjutsu illusions in the original work, it plays an important role every time it appears.

From the curse mark on Sasuke's body to the evil sealing seal cast by Kakashi, from Orochimaru's five-element seal to Jiraiya's five-element seal.

There are also Tsunade's Yin Seals, various seals of Human Pillar Force, and even the Six Dao Immortal Brothers' Seal Otsuki Kaguya, all of which involve the use of sealing techniques.

Natsuhiko's journey to learn sealing began with a book called "Introduction to Sealing".

This book is a textbook written by the master of sealing art Vortex Mito himself when the ninja school was first established.

There are detailed annotations on the various basic runes used in sealing, which is very suitable for beginners to get started.

From the most fundamental two runes, yin and yang.

Then to the five elements corresponding to the basic chakra attributes: fire, wind, water, earth, and thunder.

Then there are the various functional runes: on, off, branch, loop, jump, select, add, subtract, multiply, divide, input, output, up, down, left, right, east, south, west, north, middle, hair, white......

Each rune is written in a different way depending on the genre, and various transformations are required depending on the specific purpose.

And this is a simplified version of Mito-sama.

It's not hard to see that sealing is like math.

Even if it's urgent, it won't be or not.

However, when Xia Yan learned the sealing technique, he felt like a fish in water.

Having worked as a programmer in his previous life, he soon discovered that the runes were very similar to something he was familiar with.

That's ...... Computer Programming Languages!

And it's a high-level language with a standard library.

In order to verify his idea, Xia Yan came up with a small invention after learning the basic runes.

A rune scroll made according to the program.

Its functionality is very simple.

When Natsuhiko typed in the chakra, a line of text would appear in the blank box in the center of the scroll.

【Hello World】

It's as if you're greeting the new world that's coming.

Natsuhiko's idea is correct!

These runes are not just tools for casting seals, but a programming language for chakra.

This made Xia Yan can't help but recall the record in "Introduction to Sealing Technique" about the inheritance of sealing techniques from the Six Dao Immortals, combined with the original plot of the original work he had seen in his previous life......

Suddenly, as if he had touched an electric door, a lightning bolt flashed in his mind!

Xia Yan has never understood before, Chakra was brought to the ninja world by Kaguya, and the seal was invented by Indra, so what did the legendary Six Dao Immortals teach everyone to clarify the truth of Chakra?

Now he understands.

It's a sealing rune.

Perhaps when the Six Dao Immortals explained the truth of Chakra to the world, they were actually teaching everyone how to program Chakra through runes.

Perhaps the so-called Ninzong is actually a programming training institution.

Then the Six Dao Immortals once wanted to connect everyone through Chakra, maybe they were building the Internet!

In this way, the Six Dao Immortals are still their peers?

Xia Yan felt that his mindset about the sealing technique had been broken all at once, and countless sparks of inspiration burst out in his mind.

With a big brain, he soon had a bold idea.

Maybe he can use this chakra programming language to build a system of his own!

Don't have a system plug-in?

Then he'll knock one for himself himself!

For a while, Xia Yan was full of pride, and he felt that his life was full of hope.

It's a pity that the ideal is very plump, but the reality is very skinny.

Building a chakra-based system is ten times more difficult than Natsuhiko imagined.

Chakra-based runic languages and electronic component-based computer languages are similar, but there are many differences in detail that cannot be copied.

Moreover, the rune language has been passed down from the Six Dao Immortal Era to the present, and after thousands of years, there are many deficiencies and omissions.

Xia Yan is like holding an incomplete and full of mistakes and mistakes in the C language textbook to learn by himself, and he has to rely on himself to stumble and slowly explore many places.

In the days that followed, he either carried out various tasks in various parts of the Fire Nation or collected sealing materials, or studied at home, merging the knowledge he had learned in his two lifetimes.

Now, six years later.

After several iterations, Natsuhiko used the chakra conduction metal he had bought with his savings to finally shrink the original mountain-like prototype into a fist-sized chakra metal ball.

He used this as a carrier and reluctantly built a simple system.

The biggest feature of this chakra-based system is that human-computer interaction can be carried out directly through chakra.

Skipped the keyboard and mouse set.

It is similar to the brain or human brain chip that appeared in science fiction movies.

However, Xia Yan didn't dare to stuff the fist-sized metal ball into his brain, but sealed it in his stomach.

Theoretically, he's still a computer man.

Not long after this "Chakra Wisdom Brain" Xia Yan was completed, there were only a few programs in it, and it was still 108,000 miles away from what he imagined.

But he felt like he had reached a bottleneck.

In order to continue to level up the system, you will need to master more sealing runes and earn money to buy rare materials.

Returning to Konoha as a sealing teacher this time was the first step for Natsuhiko to solve these problems.

Yes, Xia Yan wants to become a teacher not for teaching and educating people, but for those books in the school library.

When the ninja school was established, the major ninja clans donated a lot of books under the call of the first Hokage, and they are still in the school library.

Although there are basically no good things, most of them are outdated, obscure ninjutsu scrolls, or some miscellaneous notes and travelogues written by predecessors.

For most people, it may be just chicken ribs, but for Xia Yan, it is an undeveloped treasure mountain.

Because there are many similarities between the runes and the ancient characters of the ninja world, it is impossible to say which book can inspire Xia Yan to recover the lost runes.

Not to mention that the library also contains ancient books on sealing techniques donated by Mito-sama on behalf of the Uzumaki clan, and it is a treasure that only a few teachers can read.

Therefore, even though Xia Yan knew that "teacher" was a high-risk profession in this world, he still decided to become an honorable teacher.

"I hope the books in the library don't let me down."

Natsuhiko muttered, casually threw the finished bamboo skewers into the trash can on the side of the road, and walked in the direction of the ninja school.

Today happens to be the start of a new semester at Ninja School.