Naruto: My version is ahead of the ninja world

The oil from Mount Myoboku does indeed lose its effectiveness quickly after leaving its place of origin; its "shelf life" is relatively short. The reason is simple: those oils are rich in natural energy, and once they arrive in areas where natural energy is scarcer, they will naturally face the problem of "evaporation".

However, this kind of failure only occurs under normal storage conditions without any treatment. The fact that the oil from Mount Myōboku is difficult to preserve does not mean that it cannot be preserved... Not to mention, the shelf life can be extended by using sealing techniques.

There's even a simpler "physical" method: making a large bag out of toad skin to store the oil... The toads of Mount Myoboku store a lot of oil in their bodies.

Jiraiya chose to refuse Hagen for two reasons. Firstly, he didn't want the things from Mount Myōboku to leak out. As the successor of Mount Myōboku, he could certainly use those oils at will, but handing them over to a third party seemed a bit unethical.

On the other hand, those oils are extremely dangerous to use, as they can draw upon natural energy and can petrify the user if not handled carefully.

Another point is that giving the things from Mount Myoboku to the people of Ryuchi Cave seems a bit strange. The Third Hokage said it nicely as "standing together," but actually calling it "opposition" wouldn't be a problem either.

"If you're planning to work towards that goal like me, then there's no need to seek the methods of Mount Myōboku... The methods of Mount Myōboku and the methods of Ryūchi Cave are different. Are they really comparable?" Jiraiya shook his head as he spoke.

He thought Yu Xian was learning immortal techniques, but in reality, Yu Xian wasn't thinking that far ahead. It was impossible for Yu Xian not to be interested in immortal techniques and immortal mode, but that was just a long-term goal; he didn't expect to master such advanced technology in a short time.

However, Hagen did not intend to explain to Jiraiya how he planned to use the oil from Mount Myōboku. If he told Jiraiya that the purpose of the oil was merely to "add fuel to the fire," then the deal would be even less likely to be completed.

Well, since we can't borrow it, Yu Xian will have to make a "transaction".

"Lord Jiraiya, don't be so quick to refuse. I'm prepared to exchange an extremely practical, highly difficult, and instantaneous advanced ninjutsu for you."

Jiraiya still shook his head. Advanced ninjutsu? His teacher was the Third Hokage. What advanced ninjutsu from Konoha hadn't he seen?

"Exchange? There's no need for that..."

However, before he could even utter his refusal, Yu Xian had already extended his left hand and held up a bright blue chakra ball.

Jiraiya's judgment was impeccable; he immediately fell silent because he could sense the chakra density contained within the Rasengan.

More importantly, this thing can be used instantly.

"No hand seals required for ninjutsu... Is this the legendary 'Rasengan'?"

"Yes."

Just as Orochimaru knew about the software modifications that Hagen had "developed," Jiraiya was also able to hear about the Rasengan... Hagen had once demonstrated this technique to the Konoha ninja.

Yugen didn't feel it was a pity to be given a ninjutsu like the Rasengan. Firstly, he had stolen the technique, and it wasn't something he had painstakingly developed himself; secondly, it wasn't Yugen's "core technology".

Even now, the Hagenkai has quite a few ninjutsu, but the only ones that can truly be called the core are "Sage Transformation" and certain related abilities, which are the truly untradeable parts.

Yugen held the Rasengan in his left hand, then pressed it against a pillar beside him, creating a round hole in it. After demonstrating its power briefly, he dispersed it.

"Such a high-level ninjutsu must have been very difficult to develop. Why are you so willing to share it so easily?" Jiraiya asked.

It was obvious that he was quite fond of this ninjutsu.

"This technique is a pure physical transformation of chakra, which requires a high level of chakra control from the user. Even if the training method were completely revealed, there would be very few ninjas who could master it."

"As for whether I'm willing to share, I know that ninjutsu shouldn't be taught lightly, but from the bottom of my heart, I am willing to share..."

"Lord Jiraiya, there's something quite counterintuitive about ninja villages: the more commoner a ninja like myself is, the more inclined I am to share my ninjutsu. Conversely, the more ancient a ninja clan is, the more likely it is to hoard its secrets."

This is purely Yugen's subjective judgment. In reality, his conclusion is not supported by data. He is just taking the opportunity to belittle the major and minor ninja clans of Konoha.

Jiraiya didn't refute this statement, not because he couldn't, but because it was unnecessary. Since he was also a commoner ninja, he had no obligation to defend ninja clans.

"You're so proud of your own possessions? You little brat, are you kidding me?"

Nevertheless, the phrase "cherishing one's own worthless possessions" still sounded somewhat jarring to Jiraiya.

"Lord Jiraiya, what are you saying? I don't understand." Yuzuru blinked, pretending that she hadn't understood Jiraiya's meaning.

Originally, Yugen was willing to offer the Rasengan, a super-advanced ninjutsu that he had developed with countless hardships and efforts, but Jiraiya wasn't even willing to offer a little oil in exchange?

This is clearly a case of exchanging high technology for raw materials; Jiraiya made a huge profit.

"Are you really willing to use the Rasengan? There's no going back afterward."

"It's just a Rasengan, Jiraiya-sama."

Just a Rasengan? In comparison, all I have is a little oil? Jiraiya has to be a bit "magnanimous" when he does things.

"Then the deal is done. We each get what we need. I'll bring you the oil from Mount Myōboku tomorrow." Jiraiya felt he had indeed gotten a good deal, and he didn't really have much room to refuse.

"it is good."

Yugen simply tossed the scroll containing the Rasengan training method to Jiraiya. Since Jiraiya was the one who originally devised the method, this could be considered returning it to its rightful owner ahead of time.

Jiraiya took the scroll, smiled, and didn't say much. The deal was done, and no one would regret it later... Both parties were trustworthy.

Yu Xian glanced at Nawaki one last time, then left without hesitation.

The next day, when he saw Jiraiya again, the other man handed him a huge scroll containing a swimming pool's worth of oil, enough for Hagoromo to use for a while if used sparingly... At this point, Jiraiya stopped mentioning the issue of it expiring easily.

Perhaps feeling that he was indeed getting a better deal, Jiraiya not only gave him some oil, but also a fire-style ninjutsu to be used with the oil, namely "Fire Release: Flame Bullet".

Although the various fire-style techniques have similar applications, Yugen doesn't mind having more ninjutsu at his disposal, so he's happy to accept Jiraiya's bonus.

The deal was struck, and from now on, Jiraiya's ninja lineage can freely create Rasengans.