Naruto: I'm really not an evil scientist!

Shinobu Kocho sensed something was wrong, took two steps back, and looked suspiciously at her smiling sister. She immediately realized she'd been tricked and angrily shouted, "You guys are playing a trick on me?! How could you do this?! Sister—!!!"

"Lord Hiruko wasn't teasing you, Shinobu. I truly am his property now."

Kanae Butterfly smiled and said, with a hint of helplessness and relief in her smile, "Lord Hiruko is the master of the underworld, and all souls naturally belong to him, including mine."

She did not reject Hiruko, because Hiruko resolved her long-standing inner conflict: whether humans and demons could truly coexist peacefully.

Kanae Kocho is an optimistic, cheerful, gentle, and kind girl. She often has a smile on her face, and her voice is as warm as the spring sun.

Because ghosts and humans were once the same kind of beings, she always felt sympathy for ghosts during her lifetime, believing that hunting ghosts was not only about saving the people the ghosts were about to kill, but also about freeing the ghosts from the sorrowful karma they had to bear.

She always hoped that humans and demons could coexist peacefully, a hope that was even considered "overly gentle" by the Stone Pillar, Gyomei Himejima.

When she made a pact with her younger sister Shinobu to slay demons together, she was prepared to sacrifice herself to protect the happiness of others.

However, being tortured to death by Upper Moon Two Doma, and the fact that she had never seen a demon that didn't eat people, both when she was alive and after her death, made her start to doubt herself: could humans and demons really live in peace?

Hiruko, on the other hand, told her directly not to worry too much about it, because whether you're a human or a ghost, it's all the same after death.

If one atones for their sins in hell after death and erases the karma from their previous life, they can be reborn into a completely new life.

"There's no need to dwell on whether humans and ghosts can coexist peacefully, after all, humans can still hurt each other."

Hiruko slowly said that as a scientific research ninja, he had a deeper understanding of life and death, cause and effect, "So I directly performed the ritual to deliver the evil spirits, dragged them into hell to atone for their sins, and then gave them a new life."

Hiruko has begun to take control of the underworld and is constantly adjusting its rules.

He happens to lack some underworld officials who can guide souls, preferably brave warriors who were quite capable in battle and had decent intelligence in life, and whose personalities are gentle and patient.

After several generations of upgrades, White Zetsu has many functions and good combat power, making it a good choice as a soul-reaping messenger, but it is ultimately somewhat rigid in terms of intelligence.

He felt that Kanae Butterfly could perfectly become the Hell Butterfly who coordinates and leads the White Zetsu and guides the wandering souls.

After being teased and joked with by her older sister, Shinobu Kocho finally breathed a sigh of relief when she learned that her sister, Kanae Kocho, was going to become a civil servant in the underworld. She scolded, "So that's how it is. You scared me to death."

"But Shinobu looks so cute when she's angry~" Kanae Kocho couldn't help but stick out her tongue, looking quite mischievous.

Let's stop catching up here for now.

Hiruko interrupted the two sisters' playful banter. As a research ninja, he was always decisive and efficient. "Kanae is currently just a soul without a physical body. If she wants to be competent for her future work in the underworld, she still needs some modifications."

With that, he used Yomotsu Hirasaka to open the gates of the underworld, and a terrifying black hole appeared in front of Shinobu Kocho, sending chills down her spine.

"Could you please be a little more lenient..." Butterfly bit her lower lip. She really loved her older sister and had only just managed to get used to life without her.

"Once Kanae is familiar with her work in the underworld, I will grant her leave to come back and visit you."

Hiruko said in a very kind and gentle manner, in his view the girls of the Butterfly Mansion were all his Hell Butterfly trainees, and would be his good employees in the future. "Don't think of me as so heartless."

Moreover, by then, you'll be able to truly touch your sister, instead of being unable to hug her even though she's right next to you.

Gee tut.

Chapter 406 The Way Kanae is Resurrected

Hiruko, as a research ninja, has her own plans regarding how to revive Kanae.

He did not intend to directly create a physical body using the method of cloning DNA and then stuff it inside, nor did he intend to directly create a physical body out of thin air using Yin-Yang Escape.

In fact, the simplest and least painstaking method of resurrection is to stuff the soul into a blank white Zetsu sac, and then, after absorbing enough nutrients, it will grow into the shape of the soul in its previous life, along with the information and obsessions it carries.

White Zetsu can function similarly to the Gigai in Bleach, and may even be more effective than ordinary Gigai.

Because of the version updates and iterations, although White Zetsu is merely a spore derivative in the form of Hiruko the Divine Tree, existing like dandruff, it also possesses extremely strong adaptability and changeability.

Moreover, when White Zetsu wears it, it's like an alien venomous creature, a powerful bio-armor.

Furthermore, due to the Gaia Memory, it has countless directions for advancement, and theoretically it has almost infinite possibilities, though this is only in theory.

If it were just an ordinary male soul with a little value, Hiruko would have simply stuffed it into a White Zetsu.

But he's a sucker for good looks, and as a seasoned pervert, he really likes Kanae Butterfly, so he'll take a different approach to create his own unique Hell Butterfly.

He plans to take root in the underworld and reform its rules, while absorbing a portion of the underworld's power and a part of his own chakra to transform into a small chakra fruit. Then, he will place the soul of Kanae Kocho into it, so that it can be reborn as his familiar spirit.

In this way, Kanae Butterfly can possess some of the characteristics of the Tailed Beasts, perfectly transforming between her energy state and physical body, and can also transform into a beautiful butterfly.

It is also bound to Hiruko and the Underworld, and can naturally use Hiruko to control a portion of the Underworld's power, possessing extremely high immortality and extremely high growth potential.

At crucial moments, it could return to its original form like Kinshiki Otsutsuki, transforming into a chakra fruit to feed Hiruko and restore her health, or it could exist as a beacon for Hiruko's revival, but this possibility is not high.

A giant cherry blossom tree in the underworld, beautiful butterflies fluttering around it, and then a white jade tower to be built. All that's missing is a two-sword style gardener who brings his own mochi... Hiruko envisioned a beautiful scene in her mind.

……

"Master, how should I address you?" Kagaya Ubuyashiki had been waiting since he woke up, and finally the person Hiruko had mentioned last night who could give him power had arrived.

This is an elderly monk who looks extremely robust. His eyes reveal a sense of vicissitude. Although he is old, he exudes a terrifying aura, as if he could crush someone into a pancake at any moment. He is a tough guy monk similar to the Stone Pillar.

"Just call me Master Beiluhu No. 1."

Hiruko No. 1 said calmly. As the assistant invited by the scientific research ninja Hiruko, he naturally had extraordinary strength and knowledge. "You are lucky to be the trial chosen by the gods. In the days to come, I will train you rigorously and help you master the mysteries of the Sage Path as soon as possible."

As a clone specializing in Hiruko's breathing techniques, Hiruko No. 1 possesses an unparalleled understanding of the Sendoh breathing method.

While he might not be as strong as Hiruko himself, no one understands the new version of Sage Mode created by the God based on chakra, the Eastern philosophy of the unity of heaven and man, and some esoteric Buddhist doctrines better than him.

"Sendoh... is this the power that sir spoke of that would give me the chance to personally destroy Muzan?"

Kagaya Ubuyashiki murmured, then asked, "Master Hiruko No. 1, can I pass on this power to the other children?"

He had no intention of monopolizing this power. In his view, it would be good to have the opportunity to kill Muzan with his own hands, but he valued the children of the Demon Slayer Corps more, because children are the hope.

If swordsmen could also obtain this powerful force, perhaps the number of team members who sacrifice themselves in the fight against demons would decrease.

“The High God has not imposed any restrictions on this aspect,” Hiruko No. 1 said with a frown. As an assistant to the research ninja, he was very clear about the characteristics and limitations of Sage Mode. “However, you’d better not have too high expectations for it.”

I know that there are some special breathing techniques in this world, but that's precisely why the Immortal Path is more suitable for people who have absolutely no foundation in it.

Furthermore, before refining life energy and spiritual power into chakra, Sage's offensive capabilities were not strong.

Having arrived in this world, Hiruko No. 1 had learned some information about it from Hiruko, so he had a good impression of the swordsmen who used breathing techniques to eliminate demons, because they were very similar to the messengers.

However, compared to the Sun Breathing Exercise, Hiruko's self-created exercise is more like a health-preserving exercise. Although both are imitations of solar energy, Hiruko's self-created exercise is obviously gentler and has greater benefits for the human body.

Aside from being particularly effective against vampires in a limited world, they aren't very aggressive in combat against humans, but they can easily prolong their lifespan.

The Breath of the Sun is even more domineering and violent, with a stronger offensive capability, and those who awaken their markings are more likely to die young.

The two have different focuses, and are not superior or inferior; they are both interpretations of life energy's interaction with the sun, one fierce and the other gentle.

The path to immortality begins with breathing. Cultivators can strengthen their life energy through breathing and temper their spirit and will through various forms of meditation and practice.

Once the life essence has grown to a certain extent, one can try to refine chakra and then control the chakra to circulate within the body to overcome the deficiency that requires breathing, so that it can be generated continuously even without breathing.

After acquiring chakra, cultivators will possess a series of incredible powers, including the ability to control wind, thunder, water, and fire, create clones, seal demons, and summon spirit beasts... Even ordinary fist and foot attacks can possess immense power.

Furthermore, if a cultivator possesses a large amount of high-quality chakra, they can modify and evolve their own genes through chakra, which is a path to godhood.

Only by refining chakra can a Sage Mode practitioner possess powerful offensive capabilities.

Ordinary people simply cannot and should not be able to refine chakra.

The simplest way to refine chakra is through word of mouth, allowing people who already possess chakra to share it with each other. In this way, they will naturally all possess chakra and be able to instinctively extract and refine it from their bodies and minds.

Alternatively, one could cultivate the Immortal Path step by step, and when one's life energy and spiritual energy are both very high, one could use the special refining and transformation method summarized by Hiruko after analyzing the Divine Tree to refine and transform them into chakra.

However, the physical constitutions of people in different worlds are different. After all, the number of human cells in the Naruto world is almost twice that of real humans, since the planet in the Naruto world has natural energy.

Therefore, the more chakra an ordinary person refines, the faster they die.

Furthermore, if one rashly extracts chakra without sufficient primordial strength, the cells may die off on a large scale immediately after the chakra is extracted, leading to immediate death.

Moreover, even the humans in the Naruto world, by constantly exploiting and extracting chakra, without Hiruko's self-created health regimen or natural energy replenishment, are committing slow suicide.

In this world, apart from Yoriichi Tsugikuni who is overpowered, swordsmen who use breathing techniques can easily split rocks. Some Demon Slayer Corps swordsmen even surpass most Chunin and some minor Jonin in the Naruto world. Their physiques are naturally not weak, and can even be said to be very strong.

However, the breathing technique they practiced was not created by Hiruko, who could restore health through breathing. Even with chakra, they could not prolong their lives, and awakening the mark at a high level would cost them their lives.

Under Hiruko No. 1's guidance, Kagaya Ubuyashiki gradually learned Sendoh and, with the master's permission, promoted Sendoh throughout the Demon Slayer Corps.

After all, becoming a swordsman requires extremely high talent. Therefore, considering the incompatibility of breathing techniques and trying to choose between existing breathing techniques and the Immortal Path is a happy dilemma for high-level swordsmen, and has nothing to do with ordinary people at the bottom who lack talent.

However, all active Pillar-level swordsmen have mastered the method of chakra refining under the infusion of power from Hiruko No. 1, and some have even developed special bloodline limits as a result.

The main reason is that their physical fitness is indeed very strong, and their mental will is also good, which fully meets the standards for refining chakra.

Moreover, out of hatred for demons, no one cares about shortening their own lifespan as long as they can gain stronger power to kill demons.

The Demon Slayer Corps also has many staff members who lack talent and can only perform logistical and medical work, as well as countless ordinary members with average talent. They could completely train with Hiruko's creation to gradually improve their physique.

Of course, the creation of Hiruko also depends on aptitude. An ordinary person who has cultivated for decades can only reach the level of Zeppeli, who can maintain health, but whose aggression is not that strong.

If you want to use it for fighting, you need to have the brains of that sly Joestar.

However, at least it has a function similar to internal healing, which can not only heal itself, but also heal its companions in critical moments. This will undoubtedly improve the medical level of the Demon Slayer Corps and the survival ability of the lower-ranking members.

Once one reaches the required level in both mind and body, refining chakra can lead to a qualitative leap, greatly expanding one's capabilities.

However, one thing is quite regrettable: after catching a few demons for testing, the effect of Sendoh on suppressing demons was not that strong.

Unlike vampires in the JOJO world, who would almost certainly die upon contact with Sendoh without the vaporization and freezing technique.

It can't be said that there is absolutely no harm. The immortal energy can still produce some effects on the ghost, similar to being scalded by boiling water, causing the ghost to feel pain and slowing down its recovery ability a little, but that's all.

The damage caused is less than what you'd get from swinging your Nichirin Blade and slashing the demon.

To completely obliterate a demon using only Sage Mode, one would need at least Kars' Sage Mode level.

However, it's not a big problem. Although Hiruko sent someone to teach Kagaya Ubuyashiki Sendo on a whim, he also thought that Sendo might not be able to subdue demons at all.

He had the Beirut 1 carry a large amount of Aja Redstone, as well as some ultraviolet lamps with Aja Redstone lampshades.

Furthermore, while transferring the curse from Kagaya Ubuyashiki's body, he also modified Kagaya Ubuyashiki's genes, giving him the Crystal Release bloodline limit and engraving the ability to manually create Aja Red Stones into his DNA, so that he could instinctively master the power to manually create Aja Red Stones as long as he extracted chakra.

Humans are meant to learn how to use tools. Hiruko never intended for Ubuyashiki Kagaya to directly confront Muzan. As an intellectual talent, wouldn't it be better for Ubuyashiki Kagaya to unleash his final Ruby Splash?

Aja Red Stone, also known as Katz Happy Stone, is a rare mineral whose crystals seem to contain countless tiny mirrors that can reflect light hundreds of millions of times, amplifying the light to an astonishing degree before concentrating it from a single point.

Even the faintest light, amplified by Aja's redstone, can easily transform into a terrifying beam of light capable of destroying a yacht's engine.

Even a dim candlelight, after passing through this magical mineral, can burn the Pillar Man, who is known for his powerful physique.

These stones were all developed by Su Zhe in imitation of the JOJO world, and they have at least 70-80% of the power.

Therefore, even the gentlest immortal energy, after being amplified by the Aja Red Stone, becomes as sharp as a laser, easily causing devastating damage to flesh and blood.