Picking up a pen and making a brief note on the scroll, Lei Luo studied the pattern between the dungeon's chakra route and the handprints for a while, and then looked at another scroll with the word "thunder" written on it.

If I'm not mistaken, that scroll should be recorded in another thunder ninjutsu that I mastered - Thunder Flow.

Thunder Flow is a ninjutsu that concentrates chakra in the hand, generates electricity, and attacks the enemy with the help of electricity. This ninjutsu is very similar to Rachel, and it belongs to melee attack ninjutsu.

Of course, its power is far from being comparable to Rachel's.

The electricity generated by this ninjutsu can only achieve the effect of paralyzing the body, and the level is only C-level.

If you ask Lei Luo to give an evaluation, it is nothing more than chicken ribs.

The electricity can't be emitted, and when you hold it in your hand, the attack power is not as good as using kunai. The meaning of its existence seems to be useful only when the intention is to capture the enemy alive.

However, it's not that we can't expand our thinking.

After thinking about it, Lei Luo still opened the scroll of Lei Dun - Thunder Stream.

Soon, he put down the Thunder Escape Scroll in his hand and looked at the last two ninjutsu scrolls, one was still Earth Escape, and the other was Fire Escape.

"Is that all......" Lei Luo sighed, deeply troubled by his "poverty".

Not only does he want to master more ninjutsu and enrich the means of warfare, but more importantly, he wants to explore the creation laws of ninjutsu, which will provide theoretical support for the development of ninjutsu in the future.

It's a pity that there are only so many "samples".

Huo Dun - Hao Fireball, Tu Dun - Tulong Gun.

One C grade, one B grade.

This is the ninjutsu recorded in the last two ninjutsu scrolls.

Lei Luo vaguely understood why the original owner of the body did not learn these two ninjutsu.

And enough to do Relo is far from a genius, at least compared to Uchiha Itachi and Uchiha Sasuke. Even if you have a fire-type attribute, it still takes a lot of time to master the fireball. As for the Tulong Gun, the B-level difficulty is not easy to learn. Even if it is mastered, it will basically drain all the chakras after being released once, and there will be no combat capability.

Learning these two ninjutsu takes a lot of time, and it doesn't seem to be of much use—that's what the original owner of the body really thinks.

In fact, the property left by Lei Luo's parents was enough for the two brothers to use for a long time, and Lei Luo came to a conclusion after flipping through the money ticket.

But for the original owner of the body, it doesn't matter if you have a sense of responsibility and are eager to prove yourself......

In short, as the owner of this family, he does not want others to see jokes that he is a waste who spends his deceased parents' money and eats it waiting for death.

Although, no one will pay attention to him......

The desire to take on tasks to earn money to support his family is unprecedentedly strong, and he wants to be self-reliant and take on the obligations of his brother. Because of this, he didn't force many things, such as these two ninjutsu that took a lot of time and were not cost-effective.

Relo was noncommittal about this approach.

"Sacrificing one's own development in pursuit of an inexplicable sense of social identity puts the cart before the horse." This is his truest thought.

In this world where power is everything, not going all out to become stronger is simply a joke with your own life.

While learning the techniques of Hao Fireball and Tulong Spear, while flipping through the cultivation notes left by his parents, time passed slowly.

……

"I'm back!"

Bang Dang!

With a childish voice, a little boy about five or six years old slammed the door in.

The little boy had clear eyebrows, bright eyes, and was carrying a small schoolbag with a wooden leaf pattern on his back, and he was looking at Lei Luo directly at this time, as if he was very surprised.

The little boy's name is the same, and he is the cheap younger brother of Lei Luo in this life.

Interrupted from his thoughts, Lei Luo glanced to the door in displeasure.

"Huh? Brother, are you back? Xiao Leitong saw Lei Luo's expression, as if he also realized his rude actions just now, and touched his head slightly embarrassed.

After that, he didn't bother to apologize, he quickly ran to Lei Luo's side, glanced around at the information spread out in every part of the hall, and asked curiously, "Brother, what are you doing?" ”

Coming back to his senses, Lei Luo put down his pen, stood up and silently looked at the "fruits of his labor" that day.

Floors, walls, tabletops, scattered paper. Some of them are the "key points" torn from the cultivation notes, some are my own understanding of certain techniques, and more are conjectures and calculation steps related to chakra and techniques.

This involves a part of the knowledge of physics, mathematics, and statistics in previous lives, so a large number of formulas and calculations are essential.

For example, the velocity and acceleration at which the dungeon is generated, the force it generates in the process, and the relationship between the mass and density of the material of the earthen wall and the unit chakra energy released. Is the mass-energy conservation formula applicable in this process? If so, what is the exchange rate?

Howe fireball is spit out of the mouth, the instantaneous rate of change of temperature at that moment, the coefficient of drag between it and the air, and the destructive power of kinetic energy and potential energy that exists at the same time as it generates thermal energy.

As for the thunderstream...... Time, Current, Voltage, Resistance...... There's so much to look into.

At first, Lei Luo only planned to consolidate the foundation, and if he was able to learn the Hao Fireball and Tulong Gun, he would have overfulfilled the task.

Unexpectedly, the explosion of mental power made his brain surprisingly good, and he finished the scheduled work early.

Lei Luo, who couldn't be idle, also took the opportunity to discuss the mysteries of ninjutsu and chakra, and tried to see if the knowledge he had learned in his previous life could come in handy here.

Maybe it's just useless work, or maybe it's a promising way forward.

However, in the current situation, it is very difficult to explain ninjutsu with scientific methodology and organically combine it with ninjutsu, because there are many prerequisites that are difficult to solve.

At the very least, you need professional tools to test a large amount of experimental data, otherwise it is just paper.

Predictably, if it were to be done, it would be a long-term project that would consume unimaginable time and effort. Of course, the benefits are also enormous.

The ninjutsu system and the industrial system learn from each other and integrate with each other...... Seemingly, it's worth a try.

Easily took off a design map pasted on the wall, folded it without leaving a trace and put it in his pocket, Lei Luo was silent for a moment, and slowly said to Lei Tong: "I'm practicing ninjutsu." ”

"Cultivation...... Ninjutsu? Lei Tong was a little dumbfounded by Lei Luo's answer, this seems to be different from what he imagined?

Is ninjutsu practiced like this?

"It's just some basic research, and if you want to become stronger, you'll experience it later."

Lei Luo casually coped with the child's questions.

Hearing this, Xiao Lei shook from side to side uneasily, he always felt that today's brother didn't seem to be right.

Suddenly, he noticed that he seemed to be stepping on something soft under his feet.

Looking down, it seems to be a ninjutsu scroll that has been spread out halfway, and the material of the scroll is different from ordinary paper, some of which look like silk, so the feeling of stepping on it is still obvious.

Similar noticed that there was a fireball written on the scroll.

There is no way, the literacy rate of children is limited, and it is normal that some words cannot be understood.

As if he suddenly thought of something, at this moment, Xiao Leitong temporarily let go of the uneasiness in his heart and looked at Lei Luo with anticipation.

"Brother, I'm six years old this year, can you teach me ninjutsu? I see that some of my classmates are going to breathe fireballs! ”

In order to emphasize the authenticity of his words, Xiao Leitong was very excited at the moment.

"The Uchiha family's fire escape is so cool! There is also Hinata's soft boxing, the fight is so fierce, and several classmates can't beat it together! ”

"They must have learned ninjutsu to be so powerful, I want to be so powerful, I also want to learn ninjutsu, brother, just teach me quickly! It's been delayed many times before! ”

The chatter in his ears finally took his attention away from the blueprints, and he glanced up at the clock hanging on the wall.

Eight-hour-to-one, huh...... The bear child came back late today, do you think it's because he hasn't come home yet?

Recalling the mode of getting along between the "brothers", Lei Luo immediately lowered his face and said in a deep voice: "Learn ninjutsu? Well? What time is it? ”

"You know crazy all day long, and you still know how to come back? I'm not at home and I'm gone? ”

"Is your homework done? Have you practiced the three-body technique? No? Want to run before you even learn to walk? ”

"Hurry up and clean up the dishes and chopsticks, and then do your homework, I'll check it later!"

Xiao Lei Tong was scolded by Lei Luo, and he only felt very aggrieved, but after so many years, he was also a little accustomed to his brother's strictness, so he stopped making a noise at the moment and ran to the kitchen silently.

"Humph! I thought it felt a little different when I came back this time, but it turned out to be the same! While washing the dishes, Xiao Lei muttered in his mouth.

For his brother who has been dependent on him for many years, the smart little Lei Tong has long figured out his character, knowing that he is a knife-mouthed tofu heart, and he cares most about his younger brother.

This time, since the ninjutsu scroll is placed in the hall in a grand manner, instead of being strictly guarded as before, it shows that my brother's attitude towards teaching his ninjutsu has changed.

Behave well in the past two days, strive to learn ninjutsu as soon as possible, and show off in front of your friends when the time comes.

Thinking of the future of "glorious", Xiao Leitong couldn't help but smile, and even the action of washing the dishes was a little harder.

……

Relo slumped on the couch and rubbed his temples.

He really has little experience in dealing with children, and the play just now is completely according to the template of "and enough Lei Luo".

It's also strange to say, Lei Luo feels that the original owner of the body has the same attitude towards his younger brother as a father does to his son, as if he has to worry about everything, is this the legendary "eldest brother is like a father"?

In addition, Lei's parents died when he was the same age, and in the past five years, it was completely the previous person who raised this child.

This is both a father and a mother, no wonder Lei Luo's life was so stressful at that time, he was only sixteen or seventeen years old, and he was about to have endocrine disorders.

For the role of "Strict Father", Lei Luo doesn't want to spend too much energy to play it, and for a younger brother like Lei Tong, Lei Luo doesn't want to train it for the time being.

The Second Shinobi War intensified, and he didn't have time and energy to waste on things that had nothing to do with getting stronger. Anyway, Lei Tong is still so young, and it's safe to stay in the ninja school, so let him grow up slowly.

As for teaching the same ninjutsu? No kidding.

Not to mention that his own time for the next few days was full, and he had no free time at all.

Let's just say that such a young child, the amount of chakra and control are not up to par, and after learning the ninjutsu of Hao Fireball, it is easy to play with fire and self-immolation.

Teach ninjutsu now? That's not helping him, that's hurting him.

Well, that's it.

Lei Luo happily made a decision.

Poor little Lei Tong, who didn't know his brother's intentions at all, was still wiping the dish diligently, trying not to leave a single grease stain.