Uchiha Kiyo's memory of Paper Release from Yun's side was also affected.
Uchiha Kiyo was extremely surprised that Paper Release was the result of an incomplete fusion of Earth and Water Release.
"So, something like this can happen during the fusion process?"
Is it possible to form a new Kekkei Genkai even if the fusion fails? It seems Konan was just unlucky.
It's likely that the fusion method or ratio was incorrect, but it still somehow reached an inexplicable balance, ultimately forming Paper Release.
However, this discovery gave Uchiha Kiyo a new insight.
In the development of Wood Release, the control of vitality might be a key factor.
Yun had done well.
As for urging himself to develop a cheat ability quickly? Oh, does he think such things are mass-produced?
The microscopic structure of the eye is far too delicate to modify so easily.
When it came to eyes, Uchiha Kiyo thought of his own Sharingan.
Back on the island, Uchiha Kiyo set aside his experiments on Wood Release development and eye modification, making time for other training and research.
Among them, the improvement of Yangyuan Gong was a major focus.
Yangyuan Gong, the fundamental method Uchiha Kiyo developed step by step from basic chakra cultivation techniques, was his most important secret art.
After successfully sensing natural energy, Uchiha Kiyo had the idea of refining and perfecting Yangyuan Gong.
He finally completed it a few days ago.
The new version eliminated tedious details like extracting nutrients from food. Instead, it directly absorbed mild natural energy from food, which was then transformed into physical energy.
This greatly simplified the process.
Although not the simplest possible version, it was still a major improvement.
Thanks to this refinement, the efficiency of Yangyuan Gong increased significantly, doubling Uchiha Kiyo's chakra recovery speed.
In his previous battle against Earth and Stone, his Three-Tails clone had already achieved a chakra recovery speed of 300 units per second. The main body had an even faster recovery rate, close to 500 units per second at that time. Now, Uchiha Kiyo's body could recover 1,000 units of chakra per second!
Furthermore, after streamlining unnecessary steps and gaining excess energy, Uchiha Kiyo was even able to continue fighting while maintaining Yangyuan Gong at full operation.
These improvements to Yangyuan Gong had little to do with his Sharingan.
What truly connected to his Sharingan was his next experiment.
Since the gentle natural energy in food, after being "tamed" through the food chain, could be directly absorbed and refined by Yangyuan Gong, could natural energy from the environment be directly fused into chakra as well?
Would it immediately refine into Sage Chakra?
With a mindset of experimentation, Uchiha Kiyo introduced a wisp of natural energy into his Yangyuan Gong system.
During this process, he meticulously monitored every detail, ensuring that natural energy did not recklessly spread into his body.
Instead of immediately starting the so-called refining process, Uchiha Kiyo continued to dilute the natural energy with the mild energy extracted from food. When he felt it had reached an acceptable balance, he began refining the mixed natural energy.
After passing through chakra infused with a special property, it merged with his spiritual energy.
The fusion was successful.
However, a portion of this chakra carried an irritable, volatile aura.
This aura felt oddly familiar—just like the chakra of a Tailed Beast.
Uchiha Kiyo could control this portion of chakra, but his command over it was far weaker than over his normal chakra.
Still, he decided to let this chakra circulate through his body, hoping that the human body could naturally filter out its irritable nature.
But he was disappointed.
The body showed no apparent ability to filter natural energy.
The volatile aura within the chakra did not dissipate, even after circulating through his body.
"Huh? Why not?"
"The natural energy from food is transformed into such a gentle form."
Unwilling to accept this, Uchiha Kiyo altered his approach. This time, he allowed the chakra to circulate through his entire body, including his brain.
Though the irritability of the chakra remained, Uchiha Kiyo noticed something else.
His Sharingan reacted.
These volatile energies seemed to stimulate the Sharingan.
This was a reaction he had never experienced since reaching the peak of the Three-Tomoe Sharingan.
Natural energy could stimulate and even promote the evolution of the Sharingan!
This discovery thrilled Uchiha Kiyo.
The Mangekyō Sharingan was within reach!
Unfortunately, the current level of stimulation was insufficient. More research was needed.
Thus, Uchiha Kiyo added another research project to his already overflowing list:
The effects of natural energy on the Sharingan.
From the fundamental principles to the degree of stimulation, he planned to study it thoroughly.
Was there more evidence of natural energy affecting the Sharingan? Beyond triggering evolution, could it also supplement ocular power?
This was an important question.
The Mangekyō Sharingan was known to deteriorate with overuse.
If natural energy could influence the Sharingan, it was worth investigating whether it could also counteract the side effects of excessive usage.
"When it comes to Mangekyō side effects, there are two known solutions: upgrading to the Eternal Mangekyō Sharingan or transplanting Hashirama's cells."
"Hashirama's cells replenish ocular power."
"What about natural energy?"
"Could it replenish ocular power as well?"
"Is there a connection between natural energy and Hashirama's cells?"
Perhaps this study should be conducted alongside his research on Hashirama's cells.
Stimulation was easy to explain—the volatile aura itself was a negative influence, almost like an emotion. It could serve as a trigger for the Sharingan's evolution.
What Uchiha Kiyo needed to determine was whether the strength of this irritability dictated the level of stimulation required for evolution.
Did unlocking the Mangekyō Sharingan require a single, overwhelming stimulus, or could a gradual buildup achieve the same effect?
These were the questions he sought to answer.
"Ah, this is exhausting."
Uchiha Kiyo sighed in frustration.
"I still have to establish my own cultivation system, complete my research on Wood Release, develop eye modifications, explore the nature of bloodline limits, and investigate the Truth-Seeking Balls and Yin-Yang Release. There's too much to do!"
"And now, I have another research project—how natural energy affects the Sharingan."
Uchiha Kiyo was drowning in research, unable to extricate himself, yet the ninja world continued to change.
Konoha and Kumogakure's skirmishes persisted, while in Amegakure, Hanzo continued to suppress the Akatsuki organization...
The ninja world remained anything but peaceful.
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