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After hearing the analysis of Gyoumei Yumei, Fushigawa Shima was surprised:

"Senpai-san, are you saying that our country is not the only one that has ghosts? Other countries also have monsters similar to ghosts? If there are really so many ghosts in this world, doesn't that mean that we humans will never be able to defeat ghosts?"

In response, Tomioka Giyuu, who is the water pillar, also said:

“And that’s not all. Even if we defeat all the demons, as long as humans don’t give up their pursuit of immortality, the demons will not disappear. There will be people conducting various research on immortality, and such research will sooner or later create a new Muzan Kibutsuji and bring more evil demons.”

Hearing this, Fuzugawa Shiya was very unhappy and said:

"Damn it, is immortality really that good? It's fine if those guys were rich and prosperous when they were alive, but they have to cause trouble to others after they die."

While everyone else was paying attention to the evil spirit, Shinobu Kocho asked:

"If Haimeishima-senpai's inference is correct, there are also demons in other countries. Then naturally, each country should have an organization to fight against demons. I wonder what the Demon Slayer Corps in other countries look like. Do they also use the Nichirin Sword to kill demons?"

Hearing Shinobu Kocho's question, Gyoumei Furumi fiddled with his rosary beads and thought:

"When I was practicing Buddhism, I had exchanges with several monks from Shenzhou. According to them, Shenzhou also has some legendary sects that have been fighting against man-eating zombies. The most famous of them is the Shangqing Sect of the Maoshan Sect. It is said that the Taoist priests of Maoshan drew black dog blood and drew talismans to ask the gods to kill the zombies. This legend has spread all over Shenzhou."

"At the time, I just thought of these as legends. Now that I think about it, since even the Demon Slayer Corps really exists, it is possible that zombies and Maoshan Taoist priests also exist. Perhaps the Maoshan Sect in Shenzhou has been fighting against evil ghost-like zombies for thousands of years, just like our Demon Slayer Corps."

When Shinobu Kocho heard Gyomei Beimingyu talking about the Shenzhou of this world, she immediately became interested.

Not only Kocho Shinobu, but other members of the Demon Slayer Corps were also very curious about Shenzhou's colleagues. Then they heard Fuzugawa Shima asked:

"Beimingyu-senpai, what is that black dog blood and the talisman for summoning gods?"

Hearing this, Xingming of Beiming Island chanted Amitabha, and then said:

"The so-called black dog blood, peach wood sword, glutinous rice, chicken blood and cinnabar are all the most masculine and yang things in Shenzhou legends. They are naturally able to restrain evil spirits and evil spirits. So in the legend, these are one of the ways that Maoshan Taoist priests kill zombies. However, these are relatively low-level methods and can only deal with some weak zombies."

"If they encounter powerful zombies, the Maoshan Taoist priests need to observe Feng Shui, arrange battle formations, perform rituals, chant spells and pray to the gods, and perform many secret techniques with special steps before they can kill the zombies. In short, the Maoshan Taoist priests have far more methods to deal with zombies than we, the Demon Slayer Corps."

"And I've heard that there are those with high cultivation in the Maoshan Sect who can draw talismans in the air without yellow paper, and cast many spells with a snap of a finger, killing thousand-year-old zombies. But their cultivation is like a myth or legend, and is no worse than that of Senior Ji Guoyuanyi in the past. So there are only a few who can have such cultivation in the past thousand years."

After hearing what Gyoumei said, everyone was filled with emotion. Shinobu Kocho asked again:

"Shenzhou is much larger than our country. Is it true that the Maoshan Sect is the only one fighting against zombies?"

"No." Beimingyu Xingming shook his head and said:

"According to many stories in Shenzhou, there are many powerful people in our Buddhist sect who kill demons and exterminate evil. For example, there is a Jinshan Temple not far from the Maoshan Sect. There was a master named Fahai in the temple. This man has profound Buddhist knowledge and once built the Leifeng Pagoda to suppress two thousand-year-old snake monsters. It is believed that the snake monsters were thousand-year-old zombies that came back to life and deceived the world. Master Fahai was a highly skilled exorcist who saw through the conspiracy and suppressed it."

"In addition to Buddhism, there are two sects in Taoism that are on par with the Maoshan Sect. The Yuqing Sect of Longhu Mountain has always been canonized by the Shenzhou court, and the Taoist priests on the mountain must have achieved great accomplishments. The other is the Quanzhen Sect of Wudang Mountain. Although it is a rising star that only emerged hundreds of years ago, its influence in Shenzhou is not inferior to the Maoshan Longhu Sect, which has been passed down for thousands of years."

"In addition to these two sects, Shenzhou is said to have the most mysterious Taiqing sect. According to legend, the Tang Dynasty a thousand years ago respected Taoism and disparaged Buddhism. The Taiqing sect became the state religion of the Tang Dynasty because of its merits in following the emperor when the Tang Dynasty was founded, and the master of the sect was once the teacher of Emperor Taizong. Therefore, it was highly respected."

"But I never thought that Wu Zetian would usurp the throne of the Tang Dynasty. In order to maintain her position, she turned to Buddhism and rejected Taoism. As a result, the Taiqing lineage was suppressed and never recovered. For hundreds of years, no news about this sect has been heard. I think it has already perished."

Speaking of this, Beimingyu Xingming also sighed:

"It is said that the Taiqing sect built towers with grass and observed the stars. Those with advanced cultivation can even know the past and the future. I don't know if it is true. I just heard that Yuan Tiangang and Li Chunfeng are disciples of the Taiqing sect. The Tuibei Tu, which has been passed down for thousands of years, is the result of the Taiqing sect's deduction."

"If all this is true, then the Taiqing lineage is truly unfathomable, and it is worthy of being the leader of the Taoist sects in Shenzhou in the past. It's a pity that the world changes and the future is unpredictable. The Taiqing lineage has calculated thousands of years of history, but it is involved in the fate of the Tang Dynasty. In the end, it was rejected by the empress and perished under the suppression of the court. It is really sad and lamentable."

Beiming Island Xingmei sighed like this, but Ubuyashiki Kazuya was secretly alert. He thought:

If our Demon Slayer Corps really develops penicillin, then our fate will be tied to the fate of the country, just like the Taiqing Sect in the past. This is really dangerous. It seems that even if penicillin is really developed, we must think of some means. Our Demon Slayer Corps only wants to kill demons, but we must not involve ourselves in family and national affairs.

After Beimingyu Xingming finished telling everyone about Shenzhou, everyone asked him about the vampires in the Far West. Beimingyu Xingming shook his head helplessly and said:

"I don't know much about the Far West, but I heard that there was a Count Dracula in the West who bathed in virgin blood for years in order to achieve immortality. As a result, he was favored by the devil and became a vampire who fed on human blood. He is like Muzan Kibutsuji, who can turn others into vampires and also possesses evil magic similar to vampire magic."

"In order to fight against these vampires, the Western Church formed priests and knights who were specifically responsible for fighting against vampires. It is said that the tools these priests used to eradicate vampires were crosses blessed by God, and things like garlic essence. I think they should have other means, but I have never heard of what these means are."

Listening to Gyoumei Beimingyu telling about the Demon Slayer Corps in foreign countries and the legends of demon slaying that were completely different from their own, the members of the Demon Slayer Corps were still not satisfied. However, everyone also knew that what Gyoumei Beimingyu just said was most likely just a legend.

The appearance of Muzan Kibutsuji was largely accidental. The Demon Slayer Corps has been fighting against demons for thousands of years, but has never encountered other demons. Since the Demon Slayer Corps is like this, demons may not really exist in other countries. So zombies or vampires may just be local myths.

In short, even though they heard a lot, the members of the Demon Slayer Corps did not take the matter of being in a foreign country to heart. After the meeting of the pillars, everyone continued to do their own things. And Kocho Shinobu naturally began the experiment of preparing penicillin according to the medical knowledge that Uchiha Izumi had mastered in the ninja world.

There is nothing much to say about the process of the experiment. After all, the medical level of the ninja world is not even comparable to that of the real world, let alone the demon world. Shinobu Kocho spent less than half a minute to develop a method for large-scale preparation of penicillin. Then he handed it over to the leader of the Demon Slayer Corps, Ubuyashiki Yoya.

Ubuyashiki Yoya also knew the importance of penicillin, so he did not run this business in the name of the Ubuyashiki family. Instead, he found a graduate student who had received favors from the Ubuyashiki family and attributed the credit of developing penicillin to him.

Then the Ubuyashiki family established a company in the name of this graduate student, and found some big families that were friendly with the Ubuyashiki family to invest in the company together. In this way, although the Ubuyashiki family could not obtain all the profits from penicillin, it also avoided becoming the target of public criticism.

After seeing what Ubuyashiki Kakuya did, Shinobu Kocho couldn't help but marvel at his methods. Ubuyashiki Kakuya was in charge of such a large Demon Slayer Corps at such a young age. He was indeed a capable man. Apart from anything else, his caution and restraint of greed alone were worth learning for many people for a lifetime.

In short, thanks to penicillin, the Demon Slayer Corps earned tens of millions of dollars in just half a year. With this money, the combat level and logistical support of the Demon Slayer Corps swordsmen were greatly improved, and Shinobu Kocho finally had the capital to conduct a detailed study of the demons in this world!

Chapter 127: Kocho Shinobu's Research Results

Because antibiotics brought huge wealth to the Demon Slayer Corps, Shinobu Kocho already had the most advanced scientific research equipment of the era. However, no matter how advanced these equipment were, they seemed primitive and crude in front of Shinobu Kocho, who had experienced the advanced medical level of the ninja world. However, even so, Shinobu Kocho still made a breakthrough in the research on demons.

In the first round of research, Shinobu Kocho first put the cells of the demons collected by the Demon Slayer Corps together with the cells of normal humans, and found that the demon cells would instinctively devour the normal human cells. After devouring, they would divide again, thus causing the demon cells to continue to increase. After repeated comparisons and observations of this phenomenon, Shinobu Kocho finally confirmed a fact:

The process of ghosts eating people is not like normal life eating through digestive organs. Ghosts eat humans at the cellular level. As ghosts eat, their cells will have the energy to split into more cells of the same type. This is why the more people a ghost eats, the more cells it can split, and the stronger it is.

After understanding this, Shinobu Kocho put the cells of other life forms together with the cells of the ghost. After comparison, she found that the cells of the ghost were not interested in plant cells, but would devour most animal cells just like human cells. These animals include not only large animals such as pigs, dogs, cattle and sheep, but even microorganisms in the air are also prey for ghosts.

However, unlike the fact that after swallowing human cells, the ghost's cells can divide immediately, swallowing cells of other animals can only slightly increase the activity of ghost cells, and cannot be digested as quickly as human cells. By repeating such experiments, Shinobu Kocho discovered many secrets of ghosts.

Ghosts don't necessarily need to eat humans to survive. Devouring the flesh and blood of other animals can also maintain the activity of ghost cells. In fact, since this is cellular swallowing, the energy conversion rate is extremely high. In theory, as long as ghosts continue to swallow the microorganisms in the surrounding air, they can maintain their normal survival needs.

Thinking of this, Shinobu Kocho couldn't help but think of Nezuko who turned into a demon in the original work. It seems that she relied on this mechanism to maintain her life activities without eating people. Even without eating, she still had energy to promote her body to evolve, and eventually evolved into a demon that could bask in the sun.

It was not until this time that Shinobu Kocho truly understood the mechanism by which ghosts eat and maintain their lives.

After recording her findings in a paper, Shinobu Kocho began her second round of experiments on ghosts. This was to conduct light irradiation experiments on the ghosts' cells to test the cells' tolerance to light of different wavelengths and intensities.

Shinobu Kocho exposed the cells of the ghosts to light waves of different wavelengths and intensities, and constantly tested and recorded the reactions of the ghosts' cells under these lights. After the experiment, Shinobu Kocho found that the shorter the wavelength of light, the more harmful it is to the ghosts' cells. In other words, ultraviolet light, which has the shortest wavelength in the spectrum, is the most harmful to the ghosts' cells.

And unlike cells that turn cancerous under ultraviolet light, ghost cells are more vulnerable at the visual level. After being exposed to strong ultraviolet light, ghost cells will collapse from the inside and turn into a pile of harmless proteins. This is why ghosts are afraid of the sun and will dissipate under the sun's rays.

From the perspective of the intensity of ultraviolet rays, even if it is only level 1-2, it will cause certain damage to the cells of the ghosts. Level 1-2 is only the intensity of ultraviolet rays in rainy and snowy weather. When the intensity of ultraviolet rays rises to level 4 or above, that is, when the intensity reaches the weather with few clouds, no rain and no strong sunlight, the cells of the ghosts will directly disintegrate under the irradiation of ultraviolet rays.

After discovering this phenomenon, Shinobu Kocho immediately realized the great lethality of ultraviolet light to demons. As long as each member of the Demon Slayer Corps has an ultraviolet flashlight, even the weakest swordsman of the Demon Slayer Corps may be able to kill the upper rank demons. And ultraviolet light is not a particularly remarkable high-tech technology for the era of Demon Slayer.

It should be noted that the earliest ultraviolet lamp was invented in 1904, and the Taisho era in which Demon Slayer was created was 1912-1926. Now it has been almost ten years since the invention of the ultraviolet lamp. Even the laboratory where Shinobu Kocho works has ultraviolet disinfection equipment. Therefore, equipping each member of the Demon Slayer Corps with an ultraviolet searchlight is not a problem at all, considering the financial resources of the Demon Slayer Corps and the technology mastered by Shinobu Kocho.

After figuring this out, Shinobu Kocho immediately reported her discovery to Ubuyashiki Yoya, hoping that the Demon Slayer Corps would immediately start researching small ultraviolet lamps. Ubuyashiki Yoya naturally attached great importance to this, and he spent a lot of money to find top students from the University of Science and Technology and hired them to design and manufacture small ultraviolet equipment for the Demon Slayer Corps.

While the Demon Slayer Corps was conducting research on small ultraviolet lamps, Shinobu Kocho began the third round of research on demons, which was to explore the evolution mechanism of demons and study whether demons could become infinitely stronger by eating humans.

Shinobu Kocho exposed a group of demon cells to the lowest level of ultraviolet light, hoping that through the influence of time and light, these cells would evolve to be able to move in the sun like Nezuko. In this way, while groups of demon cells died under ultraviolet light, cells with strong resistance to ultraviolet light appeared one by one.

Then, Kocho Shinobu exposed these cells to stronger ultraviolet light, continuously selecting cells that were strong enough, and continuously placing stronger cells under stronger ultraviolet light. After a long time, Kocho Shinobu finally explored the limit of the evolution of the ghost cells.

When the intensity of ultraviolet rays reaches level 10, which is the level of scorching sun, the ghost's cells will gradually stop evolving. After that, even if it takes a long time, the ghost's cells will not be able to withstand higher energy ultraviolet rays. And when the ghost's cells evolve to this level, they will also lose many of their original abilities due to over-evolution.

For example, the ability to devour living cells will be lost under level 10 ultraviolet rays. The ability to rapidly evolve and divide will also be weakened under ultraviolet rays. If we really want to describe the state of ghost cells under level 10 ultraviolet rays, it is that such cells will become very similar to human cells.

It can even be said that they are exactly the same, with almost no difference!

After observing this phenomenon, Shinobu Kocho suddenly realized that demons were originally transformed from humans. Moreover, the method for demons to become humans is very simple. All they need is blood from a powerful demon. As for the method for demons to become humans, it is not very difficult either. In the original work, only a special potion was used to transform Nezuko and Tanjiro from demons into humans.

The transition between human and ghost was so easy, which could only prove one thing:

Ghosts and humans are essentially the same creatures.

Moreover, considering the evolution and diversity of ghosts, humans should be a subspecies of ghosts, rather than the subconscious belief of most people that ghosts are heretics of humans. In other words, humans in the Demon World should be a special kind of ghost, and humans turning into ghosts is not a disease, but a phenomenon of atavism. Ghosts are the true face of humans, and humans are just a special form of ghosts.

After realizing this, Shinobu Kocho became more and more curious about the life essence of humans in this world. It was obvious that the life essence of humans in the Demon Slayer world was definitely different from that in other worlds. Humans in this world might not even be vertebrates, but rather a special type of cellular organism that could evolve rapidly by devouring each other.

All in all, the above are the results of Shinobu Kocho's research this year.

Although her research methods were very primitive due to the limitations of the times, and she couldn't even sequence the genetic information of humans and demons in this world, but relying on these simple and primitive methods, Shinobu Kocho's research results have exceeded the imagination of many people in the Demon Slayer Corps.

In every meeting of the pillars, when Shinobu Kocho spoke of her research results, it always caused a burst of exclamations from the people present. Especially when Shinobu Kocho spoke of the inference that "the essence of human beings is also a kind of demon", even Ubuyashiki Yoshiya, the leader of the Demon Slayer Corps, was silent for a long time before saying:

"This truth is really hard to accept!"

No matter how hard it is to accept, the Demon Slayer Corps can only choose to accept this fact. After all, when studying demons, Shinobu Kocho used the simplest and most basic research methods, and everyone can easily understand the research principles. So even if they don't want to agree with the various research results given by Shinobu Kocho, they all know rationally that all of this is correct.

Chapter 128: The Doctor Hidden in the Veil of History

"Amitabha, I never thought the truth about ghosts would be like this."

At another meeting of the pillars, after learning the truth from Kocho Shinobu, Beimingyu Xingming said sadly:

"Since demons and humans are one, the battle between our Demon Slayer Corps and demons will never end with the death of Muzan Kibutsuji. As long as human civilization exists, as long as people still desire immortality, demons will exist forever and continue to revive and eat humans."

"And judging from the difficulty of transformation between ghosts and humans, it should be a common phenomenon for ghosts to become humans. The zombies in Shenzhou and the vampires in the Far West should all be real." Fuzugawa Shima said this, and his scarred face looked towards the west again, and then said:

"But if you think about it, we, the Demon Slayer Corps, are not alone!"

"Not bad." Tomioka Giyuu said calmly:

"Since zombies and vampires exist, then the Maoshan Sect in Shenzhou and the believers and knights fighting against evil spirits in the Far West should all be real. If possible, as companions fighting against evil spirits together, we, the Demon Slayer Corps, should find a way to contact them and exchange experiences."

As the pillars of the Demon Slayer Corps expressed their opinions, Ubuyashiki Yoshiya, the leader of the Demon Slayer Corps, said:

"Compared to our counterparts in other countries, the biggest problem we, the Demon Slayer Corps, are facing right now should be the internal situation of our country. Have you ever thought about how many evil spirits our Demon Slayer Corps can kill in a year?"

Hearing this, Tomioka Giyuu stretched out his fingers and thought:

"I killed 27 evil spirits last year. I think the other pillars are about the same. Shinobu killed fewer evil spirits because she focused on research and had to take care of the Butterfly House. But even she killed eight or nine powerful evil spirits this year."

"That means even if we don't count other swordsmen, we, the pillars alone, kill more than 100 demons every year. If we count the members of the Demon Slayer Corps, at least 300 demons die at our hands every year."

Hearing this number, Fuzugawa Shima was surprised:

“I don’t feel anything when I kill them normally, but how come our Demon Slayer Corps has killed so many demons? Muzan Kibutsuji is just too fond of creating his own kind!”

In response to this, Beiming Island Xingming clasped his hands together, shook his head and denied it:

"It's not just Muzan Kibutsuji. According to the information we have from the Demon Slayer Corps, upper-rank demons also have the ability to turn humans into demons. But even if we count the upper-rank demons, there are no more than ten who can turn humans into demons. With just these few demons, more than 300 demons are created every year. This is really unusual."

"Could it be that one of the upper-rank demons particularly likes to turn other people into its own kind?" Tomioka Giyu speculated.

"Impossible." Shinobu Kocho shook her head.

"Not to mention that other humans are already food for demons. Few demons would leave food uneaten and turn it into demons. Even if the upper ranks can control their desire for human flesh and blood, they won't turn people into demons casually. After all, the transformation between humans and demons requires the upper ranks to pay with their precious blood, and each transformation is a weakening of their strength."

"Even for upper-rank demons, the number of times they can transform humans into demons should be limited. It's impossible for them to transform hundreds of people into demons every year. If that were the case, even Muzan Kibutsuji might not be able to handle it."

"Then there is only one possibility!" Ubuyashiki Kazuya thought:

"Most of the demons that we, the Demon Slayer Corps, have killed have nothing to do with Muzan Kibutsuji. There are other people who actually created these demons, and Muzan Kibutsuji is most likely just a cover-up to divert the attention of the Demon Slayer Corps."

Everyone present was actually mentally prepared for Ubuyashiki Yoshiya's conclusion.

Shinobu Kocho was able to discover the huge secret between ghosts and humans with just one year of time and some simple observation experiments. There is no reason why others cannot do it. There are many people in this world who know about ghosts, and Shinobu Kocho is not the only one who has studied ghosts. Especially after the introduction of modern Western medicine, there are many people who have the conditions to study ghosts.

With the world's desire for immortality, there will definitely be a large number of people conducting research on demonization. No matter what the results of such research are, it is possible to create new demons. Once these demons lose control, they will naturally kill people all over the country. That's why the Demon Slayer Corps faces so many man-eating demons. Obviously, all this is the result of the undercurrent in the country.

And not only that, Ubuyashiki Yoya also said:

"At the Hashira Council meeting a year ago, we discussed the Ubuyashiki clan's pursuit of immortality. After that, I realized that there were secrets in the Ubuyashiki clan's history thousands of years ago. So I searched again for various notes handed down by the Ubuyashiki clan over the past thousand years. After flipping through and investigating, I found something suspicious."

Something fishy?

Then Ubuyashiki Yoya continued:

"I have always believed that the reason why Muzan Kibutsuji became a demon was due to the research of our Ubuyashiki clan. It was our Ubuyashiki clan's desire for immortality that caused the deformation of their offspring, which led to the birth of the monster Muzan Kibutsuji. But according to the results of my latest research, I found that Muzan Kibutsuji's transformation into a demon is not simple."

"In fact, due to various modifications to the offspring, the physical condition of our Ubuyashiki clan was already very poor when Muzan Kibutsuji was born. Especially Muzan Kibutsuji, when he was born, he was almost regarded as a dead baby because of his poor physical condition. Later, even though he survived tenaciously, it was determined that he would not live past the age of 20."

"Originally, Muzan Kibutsuji should have died like this. At that time, no one in the Ubuyashiki clan took this weak member of the clan seriously. But at this time, a doctor came to the Ubuyashiki clan. He claimed that he could cure Muzan Kibutsuji's terminal illness and prepared a special medicine for him."

At this point, Ubuyashiki Yoya paused for a moment, and Kocho Shinobu continued:

"Is it true that after taking the doctor's medicine, Muzan Kibutsuji turned into a demon?"

Ubuyashiki Yoya nodded and said:

"good."

"So, this doctor is very suspicious!" Fushigawa Minoru said coldly.

"It is indeed suspicious." Ubuyashiki Kazuya nodded and said:

"According to the records of our ancestors, the doctor's medicine seemed to lack a main ingredient, a herb called blue spider lily. So after taking this medicine that lacked the main ingredient, Muzan Kibutsuji did not recover his health, but instead turned into an evil ghost who craved flesh and blood. After becoming a ghost, Muzan Kibutsuji mistakenly believed that the doctor's medicine had no effect, so he killed the doctor."

"Kill him?" Beimingyu Xingming frowned and said:

"A doctor who can create a drug that turns people into ghosts must be extraordinary. How could he die so easily?"

"I think he is not dead, and is even still alive!" Fushigawa said viciously. Obviously, he has concluded that this doctor is the culprit of everything, and this doctor is probably a ghost.