"Tanjiro's father has already reincarnated."
Looking at Tanjiro's revived mother, younger brothers, and sisters, but with his father conspicuously absent, Adam guessed that his father, having died earlier and from natural causes due to illness, had most likely already reincarnated.
Only then would he be unable to revive.
"Let's leave it at that for now."
Adam placed Tanjiro's family into the Primordial Space, then teleported away again.
This time, he arrived above a somewhat bustling city and quickly pinpointed a large Villa within it.
His mental scan swept over the Villa, and in the study with drawn curtains, he saw a small boy whose body contained the same dark energy as the Upper Rank Three Akaza.
However, compared to Akaza, the energy within this small boy was purer and much more immense.
"This should be Kibutsuji Muzan, the progenitor of demons."
His mental power could instantly envelop the entire Planet, so finding Kibutsuji Muzan was naturally not a difficult task.
As long as he located any life form with energy similar to Akaza's, it was definitely a demon, and finding the one with the most immense energy among them would undoubtedly be Kibutsuji Muzan.
Actually, he wasn't originally interested in the demons of this World, but after thinking about it, it was a new type of energy after all.
He could extract its fundamental essence, then transform it into a neutral energy like the one in Nezuko's body, possessing all the abilities of a demon while overcoming all its weaknesses, and then integrate it into his own power structure to form a new energy Planet.
Adding a new characteristic to his Supreme Power.
In the future, if he wanted to bestow immortality and power upon Oleg and Elena, who were ordinary humans, he could simply give them a drop of his blood.
Therefore, he decided to visit Kibutsuji Muzan before leaving and extract some energy samples to take back for modification.
Of course, he could also look into Kibutsuji Muzan's memories to understand how demons came into existence, and to learn more detailed information about this World, checking for any overlooked areas.
It stood to reason that in this World, there should be no one who understood it better than Kibutsuji Muzan, the longest-living demon.
"Useless! To be killed by the Sun! An Upper Rank demon making such a basic mistake! It seems I've been too lenient with them!"
Kibutsuji Muzan, currently disguised as an adopted child of a pharmacist family, was in his study researching information to find the Blue Spider Lily that would allow him to overcome the Sun, when he suddenly stiffened mentally, a look of anger appearing on his face.
As the progenitor of demons, he could freely view the memories of all his subordinates, no matter where they were.
Because the earrings of the young demon slayer he had seen earlier reminded him of Yorichi Tsugikuni, who had almost killed him years ago, he had dispatched Lower Rank One Enmu and Upper Rank Three Akaza to kill that young demon slayer.
However, he hadn't expected this mission to fail.
He could understand the death of Lower Rank One, as Lower Rank demons rarely achieved the feat of killing a Pillar, but the death of Upper Rank Three was beyond his expectation.
Akaza had killed many Pillars, and the crucial point was that he was ultimately killed by the Sun due to carelessness.
"A miraculous Doctor who can instantly heal human injuries, interesting, interesting."
Subsequently, an amused expression appeared on his face.
From Akaza's memories, he had seen the human Doctor in this battle who had instantly restored Flame Pillar Kyojuro from near death to completely unharmed.
He was very interested in this Doctor with special abilities.
"Perhaps he will be useful for the new medicine I'm researching to overcome the Sun.
If not, then I'll just eat him. In any case, I cannot let the Demon Slayer Corps get him, or it will be troublesome."
He decided that when he convened the Upper Rank demons for a meeting later, he would issue an order to capture that human Doctor.
As he pondered, a strange voice seemed to echo in his ear.
"Time Freeze!"
Adam instantly appeared behind Kibutsuji Muzan, activated Time Magic, causing time in the Villa to freeze, then placed his hand on Kibutsuji Muzan's head and began to read his memories.
A moment later, he stroked his chin.
"Yorichi Tsugikuni, Sun Breathing Technique, Demon Slayer Mark; there truly are some unique elements."
In just a few seconds, he had reviewed all of Kibutsuji Muzan's memories.
This fellow was born a thousand years ago into the noble Ubuyashiki family, which is the family that founded the Demon Slayer Corps and whose members served as its successive leaders.
Because he was born as a stillborn infant, despite his tenacious will to live allowing him to survive, his body was extremely frail, and he was diagnosed with not living past twenty years old.
Later, he met a kind Doctor who, in an attempt to prolong his life, formulated a new medicine. However, after taking it, he found that his body not only didn't improve but worsened.
In a fit of rage, he killed the Doctor.
Yet, not long after, he realized his mistake, because his body eventually recovered and became incredibly powerful and perfect, even comparable to a deity.
However, he acquired a fatal weakness: he could not be exposed to sunlight.
Unfortunately, by then, the kind Doctor had already been killed by him. He could only study the Doctor's prescription, and from it, he understood that the main ingredient that transformed him into his current state was a miraculous plant called the Blue Spider Lily.
This flower only bloomed during the day and would wither and disappear after only a few days each year, making it a matter of luck to encounter it.
To overcome this sole weakness and become a perfect existence like a god, he began to mass-produce demons using his blood, utilizing countless humans to help him search for the Blue Spider Lily.
Hundreds of years later, he still hadn't found the Blue Spider Lily, but the vast numbers of demons he had created had already become a calamity for humanity.
It was then that a man named Yorichi Tsugikuni was born, and he created a miraculous fighting style called the Sun Breathing Technique, joining the Demon Slayer Corps, an organization that existed to kill demons.
Under Yorichi Tsugikuni's guidance, members of the Demon Slayer Corps developed breathing techniques suited to their individual constitutions, such as Water Breathing, Flame Breathing, and Wind Breathing, greatly enhancing their strength and enabling them to truly contend with powerful demons.
Due to the deaths of his subordinate demons, he sought out Yorichi Tsugikuni, intending to eliminate this insignificant human.
However, despite his invincibility, he was nearly defeated in one go, only narrowly escaping by splitting into eighteen hundred fragments.
From then on, he was terrified and hid, not daring to show himself openly even after Yorichi Tsugikuni died, nor did he dare to fight the Demon Slayer Corps, fearing the emergence of another Yorichi Tsugikuni.
All battles with the Demon Slayer Corps were entrusted to his subordinates, and he never personally intervened.
What interested Adam now was Yorichi Tsugikuni, who created the Sun Breathing Technique; his strength indeed far surpassed that of the Flame Pillar, and a Demon Slayer Mark appeared on his forehead during combat.