With his foundation reaching this level, Jokichi felt it was time to learn ninjutsu.
On this day, he took a leave of absence from the academy.
Then he returned home and locked his door from the inside.
Turning on the light, Jokichi sat in the center of the dojo, took out the training scroll given by Itachi, and opened it to read.
Learning ninjutsu was not something you could master just by knowing how to use it.
One also needed to meet the corresponding requirements.
That is, the shape transformation and nature transformation of chakra.
Setting aside things like curses, ninety-nine percent of ninjutsu possessed a shape.
And only by mastering the shape transformation of chakra could one give shape to ninjutsu.
For example, Earth-Style Wall, Water Dragon Bullet, or Great Fireball.
They were respectively in the shape of a wall, a dragon, and a fireball.
Depending on the complexity and simplicity of the shape, the requirements for the caster's control over the chakra shape transformation were also different.
If the degree of control over the chakra shape transformation was sufficient, even with the same ninjutsu, one could play out different variations.
For example, carving a dog's head on an Earth-Style Wall.
Of course, to learn ninjutsu, just knowing the shape transformation of chakra was not enough; one also needed to learn the nature transformation of chakra.
Take the Great Fireball as an example.
This is a ninjutsu that mobilizes chakra through hand seals and then spews it out to turn into a fireball.
This process not only requires shaping the spewed chakra into a spherical form but also transforming the nature of the spewed chakra into fire, making it burn.
Without knowing the nature transformation of fire-attribute chakra, what is spewed out would just be a diffusing ball of chakra without the slightest power.
Of course, there are also ninjutsu that only require the shape transformation of chakra to be used.
Such as the Clone Jutsu, Transformation Jutsu, and Rasengan.
Especially the Rasengan.
Because of its constantly rotating and compressing shape, the requirement for controlling the chakra shape transformation almost reached the extreme.
If one could learn the Rasengan, then when learning other ninjutsu in the future, one would not have to worry about insufficient control over the chakra shape transformation.
Besides this, there are some that seem not to require nature transformations but actually involve Yin and Yang nature transformations.
For example, the Nara clan's secret jutsu involve Yin nature transformation, and the Akimichi clan's secret jutsu involve Yang nature transformation.
To put it plainly, the shape transformation of chakra is the degree of control over chakra.
Jokichi had undergone tree climbing and water walking training, which could meet the learning requirements of most ninjutsu, so he temporarily did not need further training in chakra shape transformation.
As for the nature transformation of chakra, this was a skill that only Jonin could master, requiring a long time of practice to grasp.
In the anime, Naruto used shadow clones to accelerate his training, which, converted to normal training progress, would take about 20 years.
However, that was only for one nature.
Even if Naruto's talent was not considered good, this time was still too long, indirectly illustrating the difficulty of mastering the nature transformation of chakra.
This is also why most ninjas do not know elemental jutsu, and even if they do, they only know one or two; this is the case even for many Jonin.
In the anime, using mastering all nature transformations and being able to use thousands of ninjutsu to describe the prowess of the Third Hokage and Kakashi, the reason lies exactly in this.
Because mastering the nature transformation of chakra is simply too difficult.
What?
You tell me Itachi could use the Great Fireball at the age of five, and the second pillar also learned it around age 6.
They are geniuses, do you understand what a genius is?
Before Kakashi even entered the Ninja Academy, he had already used ninjutsu of at least two nature transformations.
At age 13, he even created the ninjutsu Chidori, which required extreme shape and nature transformations.
People cannot be compared with one another.
As for Jokichi...
He was actually fully confident in training the nature transformation of chakra.
Even if his talent was not good, he could learn from Naruto and use shadow clones to cheat in his training.
He possessed the Perfect Sage Body and the Ring of Kurama; his chakra volume was only more, not less, compared to Naruto, and his recovery speed was even much faster.
However, before this, he needed to test his own chakra nature.
Although he had roughly guessed his own nature.
But it was still better to confirm it.
Jokichi took out the chakra induction paper he had purchased beforehand, and then outputted his chakra.
Instantly, the chakra induction paper showed a reaction.
One corner wrinkled, one corner burned, one corner got wet, one corner crumbled into dirt, and then the middle was split open as if cut by a sharp blade.
Looking at the changes in the chakra induction paper, a trace of a smile outlined the corners of Jokichi's mouth. Sure enough, it is all natures.
Chakra natures possess a total of seven attributes: Wind, Fire, Lightning, Earth, Water, Yin, and Yang.
Everyone is born possessing at least one or more natures.
But apart from innate natures, they can also be acquired later.
In the anime, Obito, Sasuke, and Naruto originally only had two or three natures, but after obtaining half of the Six Paths' power, their natures became six.
Jokichi was unclear about how many natures he originally possessed.
But from the moment he absorbed the Sage Crystal and gained the Perfect Sage Body, his chakra natures became at least six.
The reason it was not seven was that the Sage Body belonged to Yang; he was not sure if his original natures included Yin. If not, then it was Yang plus the five basic elemental natures.
However, Jokichi's Mangekyo could use Tsukuyomi, which meant he possessed the Yin nature.
The Yin nature represents spiritual energy, and Yin Release can create form out of nothing. The Yang nature represents physical energy, and Yang Release can breathe life into form.
Normally, most ninjutsu related to the body and chakra belong to the Yang nature, which is Yang Release, such as the Akimichi clan's Multi-Size Jutsu, the Senju clan's Monstrous Strength, medical ninjutsu, etc.
Most ninjutsu related to the spirit belong to the Yin nature, which is Yin Release, such as most genjutsu. The Nara clan's secret jutsu also uses the Yin nature to transform shadows, and so on.
After understanding his own chakra natures, Jokichi began to consider which nature transformation to prioritize learning.
What was recorded in the training scroll given by Itachi was the training method for the Fire nature, followed by a series of the Uchiha clan's secret Fire Release jutsu.
And through his understanding from the anime, he knew the training method for the Wind nature.
Logically speaking, Jokichi should have chosen the Fire nature.
However, because of the anime's influence, Jokichi was somewhat unfavorably disposed towards Fire Release.
Although it is grand in scale and also very handsome, but...
It cannot kill anyone.
Moreover, he knew the training method for the Rasengan. If he trained the Wind nature transformation, he could develop the Rasenshuriken in the future.
Furthermore, the process of training the Rasengan could enhance his degree of control over chakra, yielding twice the result with half the effort when learning other ninjutsu in the future.
However, whether it was training the Wind nature or Fire nature, the commotion would not be small.
Even if he chose a remote training ground to practice, it would be very difficult to hide it from the Third Hokage.
Then the question comes.
Where did you learn the training method from?
Therefore, before training, he still had to obtain an open and aboveboard avenue for training.
Moreover, training the chakra nature transformation required a massive amount of time; he had to find a reason to ask for a long leave of absence from the Ninja Academy.
As for why not graduate early.
Are you stupid!
Refusing a stable development environment, insisting on running off to take risks.
Without a hundred percent certainty of saving his life, even if Naruto and the others graduated, Jokichi would also deliberately perform poorly and choose to be held back a year.
That is right, I am the legendary cautious ninja.