Demon Progenitor Development Project

After drinking the blood, Ubuyashiki Eiji remained remarkably healthy, so much so that his colleagues couldn't help but marvel at his good health.

"Young Minister, you are robust and do not look old." A casual remark from an old colleague made Ubuyashiki Eishi realize the key point.

Does he seem to never grow old?

This made Ubuyashiki ecstatic.

Time has proven Eiji Ubuyashiki's ideas right.

He has indeed stopped aging, or rather, he has gained a lifespan far longer than that of humans.

While his peers were already old and frail, he remained energetic and active in Kyoto.

Living a long life means being more knowledgeable and well-informed.

"Evil ghost?"

Ubuyashiki Eiji listened thoughtfully to the yokai legends that had been circulating in Kyoto recently.

A man-eating monster that only appears at night.

The corpse lay on the ground, its flesh mangled and bloody, as if it had suffered an extremely brutal attack.

The tattered clothes were mixed with blood and flesh, making them indistinguishable from each other.

Blood was everywhere, forming horrifying pools of blood...

This reminded Ubuyashiki Eiji of someone, someone he had tricked into becoming crippled and dying a very tragic death—the previous emperor.

Is it him who's back?

Ubuyashiki Eiji had foreseen this; if blood alone could create such a being, then Muzan himself would only be stronger.

However, Eiji Ubuyashiki never expected that he would be so lucky as to encounter a real demon.

He wasn't some inferior being like him; he was a powerful, high-level demon with Blood Demon Arts.

A grotesque ghost with two horns on its head walked down the street, grinning.

"I hate nobles the most, and nobles taste the best!"

The moment he saw the other person, Eiji Ubuyashiki knew that the other person could not possibly be Tsukihiko.

Then they are the relatives of the transformed.

Ubuyashiki Eiji was almost being toyed with like a cat playing with a mouse. If it weren't for the patrolling soldiers he attracted and his own relatively good stamina as a half-human, half-demon, he would have been able to drag it out until dawn.

A savage and ignorant henchman almost killed him.

This fact was unacceptable to the proud nobles.

Why is there such a huge difference in power when they all come from the same source?

Could it be a problem with the amount of blood consumed?

After successfully transforming Muzan into a demon through his blood while he was half-human and half-demon, Eiji Ubuyashiki realized the biggest problem—there was too little of Muzan's blood.

Fujiwara Shugo probably never intended to mass-produce creatures like himself from the very beginning.

After completing the preliminary experiments and then ingesting the remaining blood myself, there wasn't much left.

Ubuyashiki Eiji's desire for more blood grew stronger.

So, he naturally began searching for ghosts and obtaining information from them.

A true demon is far more powerful than such an inferior being, possessing a stronger physical body and the wondrous power of Blood Demon Arts.

Although it has the disadvantages of sunlight and wisteria flowers, and its diet is limited to humans.

But the sheer power was enough to stir Ubuyashiki's heart, followed by an increasingly intense hatred for Fujiwara Shugo, a hatred that the other had stolen such a treasure from his hands.

During this time, he would occasionally encounter Tsukihiko, who had changed his name to Kibutsuji Muzan.

To be honest, Muzan's acting skills and disguise were obviously fake to the old fox.

After observing Muzan for a long time, Eiji Ubuyashiki realized Muzan's uncontrollable behavior and gave up the idea of ​​getting blood from Muzan.

The fact that all demons must obey Muzan also made Ubuyashiki Eishi very wary.

He didn't want this rebellious son to ride roughshod over him.

Moreover, there was absolutely no father-son relationship between them.

Ubuyashiki Eiji projected his own experience onto others, having no doubt that Muzan would kill him upon seeing this outcast who was beyond his control.

There is no room for two tigers in one mountain, except one male and one female.

He had no choice but to focus his energy on improving the power of a half-demon like himself, secretly capturing a very small number of demons for research.

After a series of inhumane experiments, he successfully awakened the Blood Demon Art in his experimental subject—his half-demon son, who was just like him.

Or perhaps it transformed into a form of life, becoming a hazy black mist.

After modifying and applying the experimental results, Eiji Ubuyashiki's awakened power is closer to the concept of Blood Demon Art.

A type of mental power, capable of exerting mental suggestion, emotional guidance, and even mind control on people, is very suitable for a cunning old fox like him.

Immediately afterwards, Eiji Ubuyashiki also began planning the establishment of the Demon Slayer Corps to deal with Muzan Kibutsuji.

Infants are very fragile little lives, especially in ancient times when medical conditions were poor, and the number of infant deaths was very high.

What's more, there's the biggest mole inside—Eiji Ubuyashiki.

Ubuyashiki Eiji personally created the so-called curse legend, incited his clan to form the Demon Slayer Corps to fight against demons, and raised the banner of fighting for the greater good of humanity to make the Ubuyashiki clan contribute to the Demon Slayer Corps.

In order to control the Demon Slayer Corps, Eiji Ubuyashiki devised a lie called the Prediction.

Using Tokuko's ability to create humanoid bodies, the specially produced 'human' replaced the Ubuyashiki baby. (Ubuyashiki Eiji: That's really useful, Tokuko!)

And babies are always born in pairs.

One remains as a medium for transmitting foresight, while the other lives on earth as a person, in the name of Ubuyashiki.

Thus, thanks to his intervention, Ubuyashiki avoided all kinds of disasters and continued to live on generation after generation, endlessly fighting against Muzan Kibutsuji.

In addition, Ubuyashiki Eiji also speculated that the blue spider lily that the doctor who treated Muzan was looking for might be related to Muzan's ability to overcome sunlight.

Whether it's killing Muzan as a threat or extracting his blood, eliminating everything related to the Blue Spider Lily becomes necessary.