Although Neji didn't obtain a true cultivation method in his previous life, he had various cultivation outlines. Combined with the detailed cultivation process of Sage Art from Mount Myōboku.
Neji could conclude that cultivating Sage Art was mainly divided into four steps: perceiving Natural Energy, attracting Natural Energy into the body, mobilizing Natural Energy to temper the body, and finally integrating Natural Energy into Chakra to form Sage Chakra and release attacks.
After thinking this through, Neji knew there was no need for further experimentation. He had to try it himself to advance the cultivation of Sage Art.
Neji returned to Konoha and rebuilt a secret underground training room in his new home. This training room was special, with three isolation doors and two independent, sealed spaces between the doors to prevent Natural Energy from leaking out of the training room when the doors were opened.
The interior of the training room was also multi-layered, with multiple layers of metal cast into the walls to prevent the diffusion of Natural Energy.
It was also equipped with an escape device, an emergency treatment device, a body data detection device, a constant temperature device, a high-power high-speed ventilation device, and so on. These devices were arguably the most advanced.
If Sasuke knew, he would probably complain, "You really don't treat money as money!"
When everything was ready, Neji, with a nervous heart, entered the sealed training room.
For his own safety, Neji ultimately chose to increase the concentration of Natural Energy in the air for cultivation, rather than direct injection.
Through the monkey's extreme experiments and a comparison with his own physical fitness, Neji roughly estimated that he could withstand a concentration of Natural Energy 587 times that of the Ninja World. Exceeding this limit could lead to unexpected dangers.
After about half an hour of meditation and breath adjustment, Neji took out the high-purity Natural Energy compression fluid and controlled the dosage to gradually increase the concentration of Natural Energy in the training room.
Neji used a five-fold concentration as a step. Every time the concentration of Natural Energy increased by five times, he would stop, meditate, and adjust his breathing, slowly feeling the Natural Energy in the space and the changes in his body. Only after fully adapting would he increase the concentration of Natural Energy again.
Thus, about three days passed. Neji stopped increasing the concentration of Natural Energy when it reached 425 times, feeling that this was his optimal cultivation environment.
If he increased it further, his physical fitness could still withstand it, but he was experiencing some discomfort mentally.
Discarding all distracting thoughts and emptying his mind, Neji fully opened his senses. He could easily feel the entire training space filled with countless points of light, including blue, red, green, black, white, and so on.
The points of light danced and spun freely in the space, full of life. This should be the so-called Natural Energy, or "Spiritual Energy"!
Neji knew that he had successfully completed the first step of perceiving Natural Energy with the help of high-concentration Natural Energy. What he needed to do now was to constantly remember this state so that he could perceive these points of light even at low concentrations of Natural Energy.
Neji did not rush to absorb the Natural Energy but continued to patiently "observe," "feel," and "befriend" these points of light, allowing his consciousness to gradually merge into them, improving his compatibility and affinity with the "points of light."
Neji maintained this state intermittently for a month. Through this month of adaptation, Neji felt as if his body had achieved the "Innate Dao Body," being extremely compatible with Natural Energy in terms of body, mind, and spirit.
With a slight breath and concentration, he could feel the countless Natural Energies in the surrounding air dancing joyfully. Even when Neji adjusted the concentration of Natural Energy to the normal concentration of the Ninja World, he could still feel the Natural Energy, albeit much less dense.
During this month, even without deliberately absorbing Natural Energy, living within it meant that he would inevitably inhale a certain amount of Natural Energy through breathing. As a result, Neji's Chakra directly increased from around 1500 units to 1700 units, nearly four times the speed of normal cultivation.
In addition to Chakra, his physical strength, recovery speed, mental state, and healing speed had all improved!
This reminded Neji of a man – Hashirama Senju, a man who was said to possess the Sage Body. The prominent characteristics of Hashirama Senju's Sage Body were precisely immense Chakra, excellent physical fitness, extremely fast recovery, near-instantaneous healing from injuries, and powerful mental strength!
These characteristics were completely consistent with the benefits brought by Natural Energy!
And his body, under the immersion of super-high concentration Natural Energy, was slowly evolving towards the Sage Body!
Moreover, it was a pure Sage Body perfectly suited for humans, not the "False Sage Mode" cultivated through the secret methods of the Three Great Sage Lands! There was an essential difference between the two.
However, without directly absorbing Natural Energy, this transformation process was very slow. Neji estimated that at this rate, it would take at least about 5 years of immersion in this high-concentration environment to possess a beginner's Sage Body.
Only by appropriately absorbing a certain amount of Natural Energy into the body through breathing techniques, forming an internal circulation, and storing it in the body could the further formation of the Sage Body be accelerated.
As for how long it would take to achieve intermediate, advanced, or perfect Sage Body, Neji himself could not estimate!
When Neji, who had been missing for over a month, reappeared before Sasuke and Haku, they initially paid no mind, as Neji had told them he needed to go into seclusion for a while. However, upon realizing it, they found something was different. They felt Neji was more graceful, agile, ethereal, and approachable!
An indescribable feeling made Sasuke and Haku stare at Neji. Neji didn't care. He didn't want to tell Sasuke and Haku about Natural Energy for the time being.
Therefore, when he left the underground training room, he specifically cleared out the Natural Energy inside to prevent outsiders from discovering anything. Anyway, Neji's acquisition of Natural Energy was easy and abundant.
The main reason was that Neji still didn't fully trust Sasuke. Recalling the original work, he remembered reading a post that evaluated Sasuke like this:
"From a prestigious family since childhood, he admired his father and elder brother, worked hard, and had a loving mother. His father was too utilitarian, his elder brother was precocious and arrogant with little human touch, and his mother was a housewife. Later, he encountered a clan incident. Above, there was a treacherous old dog; internally, there was a clan traitor colluding with troublemakers. The clan's rash warriors, with their fragile hearts and political struggles, were corrupted and became sacrifices. Their rebellion was nipped in the bud. Overnight, the old, young, women, and children all perished. A tragic family misfortune.
Past deeds: Defected from the village and joined evil, killed his brother and master, joined a terrorist organization and attempted to steal nuclear weapons, wreaked havoc at the Five Kage Summit, abandoned friends, estranged wife and children.
Achievements: In the pursuit of justice and retribution, he eliminated his own kin and master, killing the perpetrator of the clan massacre and the rogue ninja who conducted human experiments. He liberated and saved thousands of captured people, killed the insidious Danzo, a hidden danger to Konoha's rotten foundation, later resurrected Orochimaru, reanimated the Hokage F4, and made every effort to end a ninja world war. During this process, he constantly pondered the meaning of nation, village, and clan, proposed a plan to reform the system for peace, and helped resolve the Infinite Tsukuyomi. Ending: Defeated (enlightened) by the protagonist representing the collective and justice. After the war, he was directly imprisoned without any merit. After his release, he voluntarily atoned."
Overall, early Sasuke was a bit erratic. He could sacrifice everything to achieve his goals, and after achieving them, he fell into long-term confusion. He was not a friend with whom one could deeply connect.
As for Haku, Haku's bond with Zabuza was too deep. It was too early to consider anything for now; it was good to keep him as he was.
Therefore, Neji still planned to explore the matter of Sage Art alone. Until he possessed absolute strength, he would never easily reveal the method of cultivating Sage Art and purifying Natural Energy to others!
New book writing, seeking recommendations and collections!