Shinra Tensei!

Although by the late stages of the Fourth Shinobi World War, most of the "cheat-using" powerhouses in the Naruto world were essentially "Polaroids"—ignoring the concept of casting wind-up times entirely—for the average ninja, the trivial processes of weaving hand signs, converting chakra, and releasing it were matters that allowed for not even the slightest bit of carelessness.

Furthermore, even if the entire procedure was executed flawlessly, the location and efficiency of the chakra release were still constrained by various objective factors, making it impossible for them to act as freely and unrestrictedly as the main cast.

As far as Soji knew, before the debut of his brother-in-law Neji, a significant reason why the Hyuga clan's ultimate technique, Rotation, was mastered only by the Main House lay in its unique mode of chakra release!

Without the guidance of secret techniques, an ordinary ninja could never achieve what the Hyuga Main House did: releasing chakra simultaneously from every tenketsu on their body and coordinating it with a spin to achieve the effect of absolute defense.

Even highly skilled Jonin, when engaged in combat, would typically only release ninjutsu from fixed points like their hands, feet, or mouth.

The puppet masters of the Sand Ninja also relied on fixed methods, connecting chakra threads through their ten fingertips to perform complex and eerie living puppet plays.

Therefore, Nara Motonari had instructed Soji to choose his hands—the medium he was most proficient with—during the initial stages of the experiment, so as to precisely control the chakra output and avoid accidents.

"Listen well. Although you have a natural talent for developing bloodline abilities, you must remain cautious when attempting anything in a brand-new field." Nara Motonari pressed down on Soji's shoulder from behind, offering final words of advice before the youth officially began.

"Don't expect to reach the final goal in your first experiment. What you need to do is verify the practical space of this new theory—pick the technique you are most confident in as your experimental medium, mobilize your chakra with the most practiced techniques, and do your best to minimize the scale of the experiment... In short, you can never be too careful."

"I understand, Teacher." Soji was someone who had always known how to distinguish good advice from bad.

He didn't find Motonari's nagging annoying; instead, he took these well-intentioned warnings to heart while mobilizing the chakra within his body to begin his first practical operation.

According to the tips from the chubby Akimichi Todo, the basic principle of the Inversion Chakra Conversion Method invented by the Second Hokage was not complex.

It was nothing more than shifting the energy conversion process, which originally took place inside the body, to the outside, thereby avoiding the risks associated with the conversion process.

In this way, the caster didn't have to worry about elements like Wind, Fire, Earth, or Water detonating prematurely inside their body, which indirectly achieved the goal of increasing output efficiency.

As for the "Harry Potter Spells" inherited within Soji, he never needed to consider spell models or activation principles when using them, which actually saved Soji the process of adapting to the new method.

Thus, when Soji released chakra from his palms and guided the external energy to become the fuel for the spell, he achieved immediate results, despite never having practiced such a technique before!

--Under the influence of Accio, a tree branch about twenty meters away was pulled and snapped by an external force, flying toward the youth like a bolt!

In the past, Soji wouldn't have been able to casually manipulate non-independent components that had tight connections to other objects; he likely would have found it difficult even to control the spell to find the accurate stress point.

Who would have thought that after switching to the new conversion method developed by the Second Hokage, the weak Accio would be visibly strengthened, capable of snapping a thumb-thick branch from a distance and completing an operation similar to Bansho Ten'in!

This left Soji, who had originally held a conservative attitude, ecstatic!

He tried hard to suppress the excitement in his heart and shared his feelings from the just-completed casting with Motonari, but the latter, aside from congratulating Soji on his fruitful first attempt, didn't seem particularly excited.

"Getting results right off the bat is a pleasant surprise. It seems your luck is indeed quite good~"

Motonari first ruffled Soji's hair, but quickly straightened his expression and continued: "However, ninjutsu is a ninja's livelihood. Beyond the strength of its effects, stability is even more important...

Dice-rolling combat that works only sometimes is not the way of a smart person. Therefore, now that you have verified the practical value of the theory, the second step you should consider is not deepening the research results, but remembering the feeling of that cast as quickly as possible and stabilizing this newly mastered skill."

"I understand. This is what the academic world calls reproducible verification, right?"

"Something like that." Motonari nodded at first, but quickly negated himself. "However, there is still a difference between learning ninjutsu and learning medical techniques. Often, subjective, idealistic feelings cannot be translated into easily quantifiable data standards... In short, try a few more times; at the very least, you must fix the correct operational procedure."

"Yes, I'll adjust and try again."

Following his teacher's guidance, Soji extended his right hand again, aiming at another sapling not far away.

He followed the procedure of his first operation, releasing chakra first and then driving the spell.

But this time, the branch he chose only pulled inward by a few centimeters before quickly returning to its original position as the wood fibers recoiled.

...Clearly, just as Motonari had feared, the pirated Bansho Ten'in failed to snap the target as it had before.

As for this result, beyond feeling slightly regretful, Soji once again realized that he truly lacked ninja talent in the narrow sense.

--The Inversion Chakra Conversion Method produced by the Second Hokage was even harder to control than expected.

Setting aside the stroke of luck during his first attempt, the youth immediately encountered accidents during his second try.

Because the timing of the conversion was poorly controlled, the subsequently triggered spell failed to successfully interface with the chakra already released outside his body!

He had wasted precious energy into the air for nothing...

Consequently, Accio reverted to being powered from within his body, and its conversion efficiency and reaction scale were naturally greatly diminished.

Having discovered the source of the problem, the youth learned his lesson and intentionally advanced the timing of the energy conversion in the third experiment that followed.

But this time, his estimation of the power supply scale went wrong!

Usually, when casting according to the normal procedure, the spell would automatically draw from the chakra pool; as long as the total reserves were sufficient to maintain the technique, there was no need to consider supply issues.

But with the conversion process moved outside the body, the scale of the spell and the energy output had to be perfectly matched!

While a small horse pulling a large cart didn't conform to natural laws, conversely, stuffing an aerospace engine into a toy car was just as likely to cause a traffic accident.

As they say, improper driving leads to tears for one's family.

After repeatedly experiencing the vicious cycle of failure, backfiring, failure, and backfiring, Soji only managed to complete four effective casts within half an hour.

Moreover, including the first round of testing, the fluctuations in the casting effects were outrageously severe.

From a gentle breeze to snapping bones, Soji had managed to turn Accio into a "gacha" skill.

It was incomparable to the "as easy as moving one's arm" effects of his previous Filth-Licking Technique or Rain Woman's Heart.

Coupled with Soji's own meager chakra reserves, which further increased the cost of trial and error, it could be said that the development of the new technique hit a bottleneck right from the start.

His vision of using Bansho Ten'in with his right hand and Shinra Tensei with his left remained nothing more than a dream.

However, even though the development of the new technique had hit a snag, his interpersonal work had to continue.

The social butterfly of Konoha spent a few days gradually adapting to the pressure of the long-distance march, then immediately became active, looking for opportunities to engage with the important figures in the logistics support team.