Naruto: I'm really not an evil scientist!

After all, in the original story, he was a fierce person who used himself as bait to lure Muzan to his destination, and then smiled as he detonated the explosives.

He was also thinking that when a conflict broke out, he would show off the unique power he had developed as a scientific ninja, such as using his self-created ninjutsu to create strange phenomena to intimidate the opponent, and then do a few more times to kill and revive people like a hidden monk, so as to convert all the members of the Demon Slayer Corps.

He originally intended to simply suppress and incorporate the Demon Slayer Corps completely, so as to avoid disturbing his and Mitsuri's private life from time to time. However, his impulsive sting operation failed.

After a moment of silence, Hiruko looked at the young man kneeling at her feet and said, "Even now, are you still worried about those Demon Slayer Corps members, Ubuyashiki Kagaya? You surprise me."

As if he were the complete opposite of Muzan, if Muzan was a disgusting evil, then Kagaya Ubuyashiki was the embodiment of human goodness, and his soul shone with a good luster.

"No need to be so nervous. I only intended for the offender to experience a seven-day nightmare. This is a special illusion I created using scientific ninjutsu. The punishment is over now, and you can get up," Hiruko said calmly. He was feeling a bit bored and, unusually, wanted to find some amusement.

Forget it, there's no point in bullying such a respectful disabled person.

"Phew... Thank you for your mercy." Kagaya Ubuyashiki breathed a sigh of relief. It was so good that the punishment was over. The Demon Slayer Corps children no longer had to worry and live in fear, unable to even sleep well.

After getting up, Kagaya Ubuyashiki carefully looked at Hiruko, who was rubbing his chin with his right hand, seemingly thinking about something.

Kagaya Ubuyashiki knew that this person was no ordinary person, so he did not dare to disturb him. Just like a primary school student being punished, he stood obediently in front of Hiruko.

At the same time, he was also thinking about how to bring such a powerful being into his own ghost-hunting camp without causing the other party to resent him.

The reason he sent people to investigate the so-called earth-burrowing monster and ordered them not to act rashly was because he had foreseen some kind of omen. Unfortunately, he was in poor health and, due to the unclear situation, he was unable to go in person, which led to his team members offending this powerful being.

Now that the main culprit has come to his door, he has a premonition that the other party can completely annihilate Muzan Kibutsuji. In addition to worry, he is also excited.

Kagaya Ubuyashiki has been committed to eliminating Muzan since birth. If he can eliminate Muzan and erase the curse of the Ubuyashiki family, he will spare no effort, including his own life.

"Kagoya Ubuyashiki, do you... want to become a hero?"

Hiruko suddenly spoke up, his scientific ninjutsu having created many miracles, perhaps it could also help this determined person before him, "Do you want to personally sever the karmic ties between the Ubuyashiki family and Kibutsuji Muzan?"

"miss you!"

Kagaya Ubuyashiki replied without hesitation, "If it can eliminate Muzan Kibutsuji, I am willing to pay any price!"

“However, I lack the talent of a swordsman.” Ubuyashiki Kagaya then snapped out of his reverie and said with a wry smile, “My body is so weak that I can barely even swing a sword a few times…”

"Physical weakness is not a problem."

Hiruko glanced at Kagaya Ubuyashiki, whose scientific ninjutsu might be able to compensate for the other's physical deficiencies. "As the leader of the Demon Slayer Corps, you are familiar with the information of every official member of the Demon Slayer Corps. Moreover, Sakonji Urokodaki has passed on information to you. You should know that this former Water Pillar is raising a child named Tanjiro Kamado."

Did you know that Tanjiro's father also suffered from a serious illness, just like you, and was unable to do heavy work?

However, ten days before his death, Tanjiro's father, in order for his family to continue to live safely in the mountains after his death, dragged his terminally ill body and hung a rope with bells near his home.

Later, using these bells, he lured out a giant bear that had been ravaging the area on a snowy, moonlit night.

Tanjuro, who couldn't even do heavy labor, severed the bear's head with a single axe stroke.

"Compared to Tanjuro Kamado, you lie on your sickbed all day, using your affected manner of memorizing swordsmen's information and visiting graves to win people's hearts and drive some children blinded by hatred to their deaths. Don't you feel ashamed at all?"

Hiruko deliberately provoked him, hoping to inspire Kagaya Ubuyashiki's fighting spirit in this way.

"I……"

Even someone as good-natured as Kagaya Ubuyashiki couldn't help but grit his teeth. However, instead of venting his anger at Hiruko for his incompetence, he genuinely began to reflect on himself, his face flushed and his body trembling as he said, "I am deeply ashamed that I gave up swordsmanship because of my weak body and took it for granted that I would use strong children to fight to the death!"

"That's right, your body should never be an excuse for you to run away like a coward."

Hiruko smiled and said, as a research ninja, he knew the power of will, "I can use my research ninjutsu to create the physical conditions suitable for you to fight."

He knew, of course, that Kagaya Ubuyashiki and Tanjuro Kamado were in completely different situations and incomparable.

Unlike the naturally weak Kagaya Ubuyashiki, Tanjuro Kamado can be considered a weaker version of Yoriichi Tsugikuni. His talent is arguably the strongest among those besides Yoriichi Tsugikuni, making him a far superior genius.

Furthermore, Tanjuro Kamado only became ill later on; he wasn't sickly from the beginning.

Besides being able to master the Breathing of the Sun, achieving maximum concentration in all his actions, including walking, standing, sitting, and lying down, Tanjuro Kamado was also a natural-born person who understood the Transparent World. He was also a natural-born potential awakener of the Mark, or rather, a natural-born person with a semi-awakened Mark, which is why his body deteriorated so quickly.

In Tanjiro Kamado's memory, before the bear could ring the bell outside the bell rope, his half-asleep father sensed its presence and beheaded it with an axe. Afterward, his father taught Tanjiro the technique of seeing through the world.

This is enough to show that the Transparent World has become Tanjuro's passive ability, which will not be interrupted even in his sleep, just like the constant concentration of the Breathing Technique.

In the setting, the Transparent World is the highest realm of martial arts that can only be reached after struggling with all one's might and enduring pain. However, Kamado Tanjuro is an ordinary charcoal seller who has never encountered a demon or fought with a human in his life. He lives in the deep mountains and forests and can kill all kinds of animals instantly. There are no enemies that require him to struggle and fight with all his might.

Therefore, like Yoriichi Tsugikuni, Tanjuro Kamado was born with the ability to master the Transparent World, and was born to stand at the finish line that martial artists and swordsmen in this world dream of.

As for the markings, the previous Flame Pillar once told Tanjiro that, as far as he knew, all the Sun Breathing users chosen by God had red scars on their heads, just like Tanjiro. Therefore, Tanjiro must also be a chosen one.

Therefore, Rengoku Makijuro believed that Tanjiro, as the successor of Yoriichi Tsugikuni's Breath of One Day, must have great power and had encountered Muzan. However, like Yoriichi Tsugikuni, Tanjiro had the ability but let Muzan escape due to carelessness. Therefore, in the early stages, he had a very bad attitude towards Tanjiro.

In fact, due to the passage of time, there are some misunderstandings about the Flame Pillar. The so-called red scars are actually the marks (sun marks) awakened by users of Sun Breathing. Apart from Yoriichi Tsugikuni, most swordsmen of Sun Breathing are not born with marks, but awaken them later.

He took Yoriichi Tsugikuni's individual phenomenon as a common phenomenon among Sun Breathing swordsmen, but he couldn't say that his information was completely wrong, because Yoriichi Tsugikuni was indeed born with a red scar (mark) on his head.

Chapter 405 Manipulating the Sisters

Moreover, the swordsmen who can be remembered for their Sun Breathing skills must be powerful, and the marks can resonate and spread. If one swordsman has a mark, other swordsmen will awaken their marks one after another. So, over time, this saying has been passed down.

However, Tanjiro denied the claim that he was the former Flame Pillar. He explained that the scar on his head was an old injury from when his younger brother accidentally touched a furnace, plus an injury he developed during the Final Selection. Therefore, he was not some mysterious chosen one, nor did he possess any heaven-defying power.

However, the light-colored scar on Tanjuro's head is congenital, and he is also the inheritor of the Breath of the Sun, which matches the previous Flame Pillar's statement. It should be considered a kind of incomplete awakening of the mark.

There was only one Yoriichi Tsugikuni. Although Tanjuro had a similar talent template to Yoriichi Tsugikuni, he was not as abnormal as Yoriichi Tsugikuni, and he did not have the good fortune to live to be eighty years old.

This incomplete mark also consumes the life force of the breathing technique user. Because of the incomplete awakening, Tanjuro barely survived the age limit of 25 for those with awakened marks, but he died in his early thirties.

Muzan targeted the Kamado family to eliminate them a year after Tanjuro's death.

The timing was just right; otherwise, in Hiruko's opinion, if Kamado Tanjuro were in his twenties at his peak and not suffering from a serious illness, he might have been able to go toe-to-toe with Muzan.

He's unlikely to defeat Muzan, since Tanjuro is just an ordinary charcoal seller who doesn't have a Nichirin Blade, doesn't know any swordsmanship, and needs to figure out how to use the Crimson Blade.

However, with the Transparent World and the complete concentration of Sun Breathing, Tanjuro's combat power wouldn't be low. He could easily defeat active Demon Slayer Corps members who haven't even awakened their Demon Slayer Mark in their Death Mode, and he could probably scare away the scumbag boss.

Therefore, Tanjuro Kamado and Kagaya Ubuyashiki are completely different cases and cannot be compared.

Hiruko felt that although it was despicable to stand on the moral high ground and criticize others, there was a strange sense of satisfaction in it. Moreover, he had already hinted so obviously, yet Ubuyashiki Kagaya was still so dejected. Who was he looking down on?

Moreover, he had his share of illnesses, so it wasn't the kind of pain you can't understand. He had every right to say that, and he could even sing a few lines of "Oh, wash the seaweed~"

"I will always remember your teachings!"

Kagaya Ubuyashiki bowed and said, "This sir is right. Physical weakness is not a reason to run away."

Even a weakling like him could be used as bait to set up an ambush, dragging Muzan Kibutsuji into a desperate situation at the cost of his own death. He should never have been so complacent as to remain hidden in the background.

Within seconds, Kagaya Ubuyashiki had already devised a vague plan to harm Muzan, demonstrating the depth of his hatred for Muzan.

"Good, very spirited! However, I'm not sending you to your death."

Hiruko said meaningfully that his scientific ninjutsu might play a key role in this battle, "Remember your current momentum, don't let it go, tomorrow some special people will come to give you power."

"Why?" Kagaya Ubuyashiki asked, somewhat puzzled. "The Demon Slayer Corps just offended you, so why would you bestow such a favor?"

"Just consider this a spur-of-the-moment thing I did to have some fun~"

Hiruko chuckled softly. His scientific curiosity always drove him to do things that seemed nonsensical but were actually profound. "Moreover, I also want to see what the people of this world are capable of when driven by hatred."

Under the moonlit night with snowflakes falling, a white Zetsu with light green hair was roaming deep in the mountains, seemingly searching for something.

This White Zetsu is a special being created by Hiruko using scientific ninjutsu, and it possesses unique abilities.

"Ah, found it!" Bai Jue exclaimed with delight as he dug through the snow and pulled out a stiff corpse.

Immediately afterwards, the White Zetsu enveloped the corpse and plunged deep into the earth, using the Mayfly Technique to become one with the earth and move at an unimaginable speed.

...The next morning, sunlight streamed through the gaps in the leaves.

After waking up, Kagaya Ubuyashiki covered his head, threw off the covers, and sat up. Looking up at the dappled shadows of the trees in the courtyard, he murmured, "Wasn't this a dream?"

His lost sight returned; he could see again, and he could see everything in the courtyard clearly. Moreover, his frail body seemed to have recovered, and he no longer felt weak.

"I... I should be able to wield the sword now. It's all thanks to that person's grace." Kagaya Ubuyashiki clenched his fists. That person wouldn't speak without reason; he might really have a chance to kill Muzan with his own hands. "Kibutsuji Muzan, I will definitely destroy you with my own hands!"

His heart was filled with anticipation for the future and hatred for Muzan.

...Inside the Butterfly Mansion, Shinobu Kocho, the Insect Pillar, who was unable to continue her mission due to a series of nightmares and had to rest in bed, slowly opened her eyes. She groggily sat up from the bed and brushed her disheveled hair that was hanging in front of her forehead.

Then, after rubbing her eyes, she prepared to get out of bed, only to find a tall, unfamiliar silver-haired man standing at the head of her bed, which startled her.

The man was handsome, with flowing silver hair that cascaded down his shoulders like tassels. His eyes were as deep as the starry sky, and he had a gentle smile on his lips. A beautiful butterfly was perched on the index finger of his outstretched right hand.

The butterfly was not a species produced in the butterfly house. This beautiful butterfly had emerald green wings with pink edges and various strange patterns on its wings.

For some reason, Shinobu felt a strong throbbing in her heart as she looked at the butterfly. For a moment, she even forgot to question the man in front of her about why he had trespassed into her boudoir. She just stared blankly at the beautiful butterfly and even couldn't help but want to reach out and touch it.

However, the moment she touched the butterfly, the entire butterfly transformed into dazzling golden particles of light that scattered from her fingertips. She scrambled to grab it, but only managed to grasp the man's fingers.

"How could this happen?" Shinobu Kocho felt inexplicably panicked and instinctively gripped the handle tightly.

“Ordinary living people cannot directly touch the soul of the dead, even if she is your sister.” Hiruko withdrew his fingers from Shinobu Kocho. His scientific ninjutsu allowed him to sense the existence of souls.

"Sister?! That butterfly was my sister? What nonsense are you talking about? My sister has already..."

Shinobu's pupils constricted as she finally came to her senses, pulling the blankets tighter around herself. "Who are you? Why are you in my room?"

"Me? I suppose I'm a villain who forcibly occupied the Underworld. As for why I'm in your room? Well, I was attracted here by your sister's soul." Hiruko smiled and waved his hand. A burst of light flashed, as if developing powder had been sprinkled on it, and a beautiful female phantom wearing a butterfly haori appeared in the room, but she had no shadow.

"Sister?! What on earth is going on?" Shinobu Kocho exclaimed, her eyes wide with disbelief.

Hiruko tapped lightly, and a wisp of chakra entered Shinobu Kocho's mind, allowing her to instantly understand the current situation.

Her older sister, Kanae Butterfly, remained in the human world to care for her, while Hiruko was a powerful evil god from another world who had come to seize control of the underworld.

This evil god has taken control of the entire underworld. Now, as the new ruler of the underworld, he wants to restore order to the underworld and plans to lock all the souls that are still in the human world into the underworld and kick them out to reincarnation one by one. Naturally, he will not let go of the ghost, Kanae Kocho.

"How could this be..." Shinobu Kocho was struck dumb, standing there in disbelief.

"Oh, right, I have something to tell you. From today onwards, Kanae Butterfly is my property."

Hiruko's lips curled into a wicked smile, as if a demon king had descended. In front of Shinobu Kocho, he gently pulled Kanae Kocho into his arms, like a bully harassing a respectable woman, and said mockingly, "It's not good for a soul to linger in the human world for too long; it will become a wandering ghost."

As a scientific ninja, Hiruko had unique insights into the study of souls, and he was well aware of the various drawbacks of souls lingering in the human world.

Kanae Kocho, who had been chatting with Hiruko all night, seemed to have accepted this arrangement. She did not refuse, but instead obediently lay in Hiruko's arms with a wicked smile on her face, cooperating with Hiruko in playing with her younger sister.

"You bastard! Let go of my sister!"

Shinobu Kocho, the sister-complex character, instantly lost her temper and jumped off the bed in a fit of rage. Like a little lion, she pounced on Hiruko and bit his arm, as if that would protect her sister.

"Oh dear, it seems we've gone too far." Hiruko chuckled as he looked at Shinobu Kocho, who was still glaring at him fiercely despite nearly breaking her teeth. His smile was tinged with amusement.

"Oh my, it's so nice to see Shinobu so energetic~" Kanae Kocho exclaimed with a smile, her smile as warm as the spring sun, but it sent a chill down Shinobu's spine.

"What's going on between you two?"