Impractical Conjecture

The Ubuyashiki Clan Head was somewhat surprised.

"Is that so? That is wonderful news..."

"This way, we can focus our main attention on the movements of Kibutsuji Muzan and concentrate our strength to deal with him."

Although he was surprised by the intelligence brought by Sarutobi Hiruzen, the Ubuyashiki Clan Head instinctively trusted this old man who possessed such immense power.

Sarutobi Hiruzen paused for a moment.

"I went to Kyoto this time and had some gains..."

"I encountered Kibutsuji Muzan."

Then, Sarutobi Hiruzen described several human faces that Kibutsuji Muzan usually used for disguise based on his memories from his past life, asking the Ubuyashiki intelligence network to keep a close watch on them.

"If I go alone, I fear I might startle Kibutsuji Muzan and let him escape."

"Kibutsuji Muzan usually disguises himself very well. If there is an opportunity to discover his whereabouts again,"

Sarutobi Hiruzen said calmly, "Just let me and Tsugikuni Yoriichi go to resolve it together."

Hearing Sarutobi Hiruzen's words, the Ubuyashiki Clan Head found each one more astonishing than the last.

Kibutsuji Muzan, the unsolvable opponent who had plagued the Ubuyashiki family for hundreds of years, seemed to be of little consequence in front of Sarutobi Hiruzen.

To Sarutobi Hiruzen, dealing with a Scum Boss—

If he, a Kage, couldn't finish the job while bringing along a cheat character like Tsugikuni Yoriichi, it would be a complete embarrassment.

Moreover, as the Ubuyashiki Clan Head looked into Sarutobi Hiruzen's sharp, dignified eyes, he guessed that Lord Sarutobi seemed to possess some kind of precognitive ability.

And the words and actions that followed from Sarutobi Hiruzen only further confirmed the Ubuyashiki Clan Head's suspicions.

"There is one more gain..."

"It is this..."

Sarutobi Hiruzen handed a piece of Scarlet Crimson Iron to the Ubuyashiki Clan Head.

"This type of iron ore grows on the peaks of high mountains and has fully absorbed the power of the sun."

"It has an extremely strong restraining effect on demons..."

"Blades forged from this iron can kill demons very easily."

"You can conduct some tests..."

Upon hearing this, the Ubuyashiki Clan Head solemnly put away the Scarlet Crimson Iron.

If what Sarutobi Hiruzen said was correct, this discovery was second only to the value of Breathing Style for the Demon Slayer Corps.

It would undoubtedly greatly reduce the casualties of the Demon Slayer Corps, as they would no longer have to fight demons until dawn every single time.

Tsugikuni Yoriichi suddenly interjected.

"Let me take a look."

Saying this, Tsugikuni Yoriichi took the Scarlet Crimson Iron and toyed with it for a moment.

Having mastered the Sun Breathing, Tsugikuni Yoriichi seemed able to sense the power of the sun within it.

"Master, there is indeed a significant amount of solar power within this iron..."

"It can indeed restrain the power of demons..."

"With blades forged from such iron ore, we can certainly slay demons!"

The Ubuyashiki Clan Head was well aware that Tsugikuni Yoriichi had mastered the Sun Breathing.

"On behalf of the members of the Demon Slayer Corps, I thank you, Lord Sarutobi..."

The Ubuyashiki Clan Head bowed slightly; his terminally ill body could only manage such a gesture.

Sarutobi Hiruzen's expression remained unchanged; he did not take the Ubuyashiki Clan Head's gratitude to heart.

From the very beginning, he had no interest in anything related to the Demon Slayer Corps; the only person he was interested in was Tsugikuni Yoriichi.

Sarutobi Hiruzen looked at Tsugikuni Yoriichi.

Everything he did was fundamentally done for Tsugikuni Yoriichi to see. Now that Tsugikuni Yoriichi had formed a bond with the Demon Slayer Corps and a subordinate relationship with the Ubuyashiki Clan Head, he naturally would not turn a blind eye to Sarutobi Hiruzen's repeated assistance, and would feel grateful, perhaps even feeling indebted in his heart.

And Tsugikuni Yoriichi would become even more dedicated to the research of Breathing Style that Sarutobi Hiruzen had requested.

Sure enough, after leaving the Ubuyashiki estate, Tsugikuni Yoriichi took the initiative to approach Sarutobi Hiruzen.

"Mr. Sarutobi..."

This time, Tsugikuni Yoriichi wore a faint, bitter smile.

"Regarding your request from last time, my abilities may be limited..."

"I still cannot achieve what you have asked of me..."

"Simulating the breathing of nature."

"After all, the concept of heaven and earth, of nature itself, is far too vast, and it lacks any fixed fluctuations."

Tsugikuni Yoriichi expressed that he was powerless to help.

"I have pondered this for a long time, yet I find no way to begin."

"Therefore, the Natural Breathing Style you requested is difficult to complete..."

Sarutobi Hiruzen was not surprised.

Back then, when Tsugikuni Yoriichi asked him which aspect of fluctuation he was most interested in or felt most aligned with, Sarutobi Hiruzen had a sudden whim and blurted out the concepts of All Things in Nature and the heaven and earth.

But in truth, if a Breathing Style could encompass all things in nature, its rank would likely transcend the Hokage world and head straight toward the level of five-star or six-star worlds.

Of course, Sarutobi Hiruzen was merely testing the waters; what if Tsugikuni Yoriichi was just that unreasonable?

"It was my request that was too unrealistic..."

Sarutobi Hiruzen nodded, unsurprised.

In reality, his true goal was not the so-called nature, as that concept was far too expansive to be contained by the supernatural powers of a low-star world.

Instead, he was after the Natural Energy that existed within the Hokage world.

If there was any way in the Hokage world to achieve safe, harmless, and limitless longevity without touching the bloodline of the Otsutsuki, it would only be through the so-called Natural Energy and Sage Mode.

However, compared to the crude Sage Mode learned by humans, which could only remain in the body for a short time, Sarutobi Hiruzen wanted to use a Breathing Style to interact with the Natural Energy in the air, achieving the same survival capabilities as those animal sages.

But as the saying goes, even a clever housewife cannot cook without rice...

Sarutobi Hiruzen felt it was a pity.

If I were to bring Tsugikuni Yoriichi directly to the Hokage world to perceive the existence of Natural Energy...

I suspect it wouldn't be much of a problem...

But there is no such energy in the air of the Demon Slayer World.

Asking Tsugikuni Yoriichi to create something out of nothing is incredibly difficult.

As for actually bringing Tsugikuni Yoriichi to the Hokage world, Sarutobi Hiruzen had asked the system; bringing an important figure like Tsugikuni Yoriichi to another world, would consume an astronomical number of Spacetime Source Points, at least an amount that Sarutobi Hiruzen could not scrape together within this world.

"It doesn't matter, Yoriichi."

Sarutobi Hiruzen suddenly had a new idea regarding a Breathing Style that would suit him.

"Come with me, I want to show you something good."

As he spoke, amidst Tsugikuni Yoriichi's confused expression, Sarutobi Hiruzen led him into his room.

Looking at Perfect 1 before him, who was neither quite human nor quite demon, Tsugikuni Yoriichi fell into a rare, brief silence.

It was not that Tsugikuni Yoriichi had any objections to using people for experiments.

Although he was kind, he was not a fool who lacked flexibility; even the Ubuyashiki Clan conducted experiments on demons using humans.

It was just that the experimental subjects were always heinous human death-row inmates.

For the sake of humanity's future, such sacrifices were considered worthwhile.

And because Tsugikuni Yoriichi possessed the Transparent World, he could instantly perceive the biological structure of any living being.

The moment he saw Perfect 1, Tsugikuni Yoriichi understood exactly what kind of terrifying potential this creature possessed.

After a long while, Tsugikuni Yoriichi spoke slowly.

"Lord Sarutobi..."

"A creature like this should not exist."

"If it were to spread..."

"It would be the end of the people..."

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