Hatake Kurone who traveled through the ninja world

"Overview of the basics of ninjutsu, principles of chakra, shuriken, illusion tutorials..." Looking at the various ninja school textbooks on the bookcase, I was quite speechless. I thought I had skipped various classes in college, but...

"Ah, you were the one who saved the teacher's son?" A lazy voice sounded in my ear.

The voice was correct. I turned around and saw a dead fish eye staring at me. However, it is much shorter than I expected. Yes, after all, Kakashi was only thirteen or fourteen years old at this time. Perhaps noticing my downward gaze, Kakashi rolled his eyes.

"Sandaime-sama has told me that I will treat you as a member of our Hatake clan for the time being. Thank you for saving the teacher's child. We will be a family from now on, Brother Kurone." Kakashi said and bowed. We felt his complicated mood, including gratitude to me and excitement of finally having a companion, but more importantly, he was still lonely, and it seemed that he still had not come out.

I took a step forward and held Kakashi's hand: "Don't say that. The fourth generation taught me how to fly the Thunder God before he left. I am considered his half-disciple. I should call you senior brother. Besides, I don’t have the strength to bind a chicken (compared to a ninja), so I have to rely on senior brother Kakashi to teach me ninjutsu.”

"You are so much older than me. It's awkward to call me senior. Well, I won't be polite anymore. Let's just call each other by name. What do you think?" Kakashi spread his hands.

"Well, please give me some advice, Kakashi."

"The Ninja School was destroyed by the Kyuubi. It will probably take several months to rebuild. Let me teach you some basic knowledge of ninjas first. You should also read the textbooks every day. This way you can relax when you go to the Ninja School. Maybe it will work. Skip the grade. After all, Kurone, you are so old, it is not good to stay in the ninja school for four years, how embarrassing, right." Kakashi said and smiled, his eyes curled into crescent moons.

I nodded. I had to improve my strength as soon as possible, otherwise it would be too embarrassing. I am a genin in my twenties, and I am not the protagonist. It would be embarrassing to tell anyone.

Just take a look, the basis of Ninjutsu is Chakra, so I think we should start with the principles of Chakra.

"Chakra is a kind of energy produced by the perfect fusion of the energy of various components controlled by the human body. It is the source of energy for performing ninjutsu, genjutsu, taijutsu, or making threads to bind opponents or cut off materials that are also composed of chakra. This energy is composed of: 1. Physical energy absorbed cell by cell from the 130 trillion cells in the human body. 2. Spiritual energy exercised through many practices and accumulation of experience. 3. If you practice immortality, one part is natural Energy. Only after extracting chakra and passing through the "seal" can you use the "technique"."

Reading the description of chakra in the textbook, I couldn't help but be a little surprised. I didn't expect that such a small chakra could have such great knowledge. Then turn to the back, and the book explains the essentials of chakra extraction, recovery methods, usage methods, etc. It's quite easy to understand. No wonder a single person in Hokage can become a ninja. There are only a handful of people like Xiao Li who can't refine chakra.

I sorted out the knowledge in the book. Chakra is generally extracted from cells using special methods. After extraction, it is transformed into various chakras in the form of seals according to the needs of the caster, such as Five elements chakra, yin and yang chakra, etc., thereby releasing the corresponding techniques. Everyone's temporary chakra reserves and chakra recovery speed are roughly fixed and can be increased through acquired practice. If chakra is excessively depleted and the body's reserves drop to 0, life will be in danger. The unit of chakra reserves is Sarutobi Hiruzen, or slash for short, named after the third generation Hokage Sarutobi Hiruzen who made significant contributions to chakra research.

"You're a ninja professor after all." I admired the third generation even more.

Suddenly, a piece of paper fell out of the book. I picked it up and looked at it. It was Kakashi's physical examination report when he first entered school. I read it from beginning to end, nothing more than height and weight, but there were a few novel contents that attracted me.

Chakra attribute identification: wind 10%, thunder 30%, water 21%, fire 20%, earth 19%

Chakra limit reserve: 62.8

Chakra recovery speed: 2.1 chops/minute

Evaluation: A very rare ninja with all attributes, average chakra reserves, and a chuunin level.

In fact, I knew that Kakashi had all five attributes, but I had never seen him use wind escape. It turned out to be because only 10% of it was wind attribute chakra. The textbook says that when the chakra attribute reaches more than 10%, it can be considered to have this attribute. But Kakashi is truly a genius. He was at the chunin level when he first entered the Ninja School. No wonder he graduated in one year.

Just when I was thinking about this, Kakashi suddenly came in and was stunned when he saw the medical examination form in my hand. He was silent for a long time and then said: "I have been looking for it for a long time. I thought I lost it, but I didn't expect it to be in this book." After saying that, he took the list I handed over and stared at it for a long time, thinking of Obito and Lin, is it still White Fang? I don't know.

After looking at it for a while, he took down a file book from the bookshelf and put the physical examination form into the empty page at the front. In the file book were his physical examination sheets from various periods. I went over to take a look, and Kakashi didn't stop me. I frowned when I saw his recent physical examination report.

The properties haven't changed much.

Chakra limit reserve: 102.7

Chakra recovery speed: 3.8 chops/minute

The average reserve of chuunin is about 60 kills, and that of jounin is about 100 kills. From this point of view, Kakashi has no problem. What is terrible is that there is a note below:

Chakra consumption speed when the Sharingan is not open: 3.3 chops/minute

Chakra consumption speed when Sharingan is open: 9.7 cuts/minute

"The Sharingan has a great influence on you, Kakashi." I couldn't help but feel a little regretful. Everyone said that Kakashi was delayed by the Sharingan, which is absolutely correct.

Kakashi nodded: "Yes, because I am not from the Uchiha clan and have a rejection reaction. Therefore, the consumption is several times that of theirs. The Uchiha clan's Chakra consumption rate basically does not exceed 0.5 when opening their eyes. But..." Kaka Nishi paused for a moment, his eyes narrowed into crescent moons, "I can't gouge my eyes out, otherwise that guy Kai won't be able to call me One-eyed Kakashi."

In fact, I know that he is reluctant to give up Obito. I want to fulfill Obito’s last wish to see the world clearly.

Probably seeing that I was a little frustrated, Kakashi patted me on the shoulder.

"You've been studying for a day, come and concentrate your chakra and let me see." He said and turned around and walked into the yard.

I am also looking forward to the results of my learning. I will be concentrating chakra soon, and I am quite excited.

"I'll use the Sharingan to help you watch the chakra flow in your body, so you can refine it with confidence." Kakashi said, pushing up his forehead protector.

"Okay!" I concentrated my energy and refined the chakra using the method given in the book.