When Emiya arrived in the new world, it was daytime.
He was in a mountain range.
Tall trees and dense foliage blocked most of the sunlight, turning the forest dim and oppressive.
Even during the day, it felt gloomy.
A faint chill lingered in the air, subtle but uncomfortable.
No matter how he looked at it, this was not a good place.
In an environment like this, Emiya wouldn't have been surprised if a demon-or a murderer-jumped out at any moment.
It looked like the perfect setting for a horror film.
Clang.
A crisp sound echoed through the mountain.
Metal striking metal.
The sound of swords colliding.
Clear.
Sharp.
It carried far in the quiet forest and reached Emiya's ears.
He grew curious.
Following the sound, he moved forward.
The closer he got, the more frequent the clashes became.
Before long, he arrived.
In a clearing, two men wielding katanas were fighting desperately.
One wore a red robe.
Tears streamed down his face as he swung his blade wildly, aiming for the other man's neck.
"If it weren't for you, Shizune wouldn't have died!"
"You deserve to die!"
The other man shouted back, insisting he hadn't wanted to do it.
That if Shizune hadn't died, he would have.
The fight escalated.
The man in red gained the upper hand.
With a decisive strike, he severed the arm holding the sword.
Blood sprayed.
The wounded man clutched his shoulder and screamed in agony.
The man in red approached him, expression empty.
"L-Let me go! Please! I didn't mean it!"
"I didn't mean to kill her!"
The pleas were desperate.
They didn't matter.
The katana fell.
His head rolled.
"You can say that to Shizune yourself."
The man in red turned and left.
A headless corpse lay in the clearing.
Then something else happened.
A translucent figure appeared beside the body.
A ghost.
Its face was identical to the man who had just died.
Emiya's eyebrows twitched.
A ghost appearing immediately after death was not normal.
In most worlds, ghosts didn't appear at all.
Or if they did, it took time.
In the Hunter world, people died constantly during the exam.
Emiya hadn't seen a single ghost.
Here, less than ten minutes had passed.
And it was still daytime.
Even with the forest blocking the sun, this was daylight.
That alone proved this world wasn't simple.
Emiya erased his presence and hid.
He watched.
The ghost stared at its corpse.
Its expression twisted, unable to accept reality.
Its face became vicious.
It bent down and tried to grab the fallen katana.
Its fingers passed straight through the hilt.
It tried again.
And again.
Nothing.
The blade lay there, untouched.
The ghost froze.
Confusion replaced rage.
After several failed attempts, it straightened up.
Its gaze locked onto a direction.
The direction the man in red had gone.
It shot forward like the wind.
Emiya followed silently.
Free of a physical body, the ghost moved fast.
In minutes, it caught up.
It lunged at the man in red, face contorted, hands reaching for his throat.
They passed through.
Its arms.
Its body.
All passed through him.
The man in red felt nothing.
He continued walking.
Unaware.
The ghost refused to give up.
It tried choking him.
Tearing him apart.
Ripping out his organs.
Nothing worked.
Not even a scratch.
Gradually, despair set in.
The ghost stopped.
It stared blankly at the man's retreating back until he vanished from sight.
It lingered.
Then, as if understanding something, it slowly rose into the air.
A faint light-imperceptible to ordinary people-surrounded it.
In the next instant, it disappeared.
Emiya was stunned.
Did it... reincarnate?
When he saw the katana duel earlier, he had already guessed this was Japan.
Ancient Japan.
Their clothes made that clear.
And in Japanese belief, "passing on" didn't mean heaven.
It meant reincarnation.
Purification.
So that ghost had purified itself.
Probably.
He wasn't certain.
But that was the most likely explanation.
Where it went afterward-Emiya had no idea.
The Underworld?
Some transitional realm?
Regardless, one thing was certain.
If ghosts could appear immediately after death, this world was dangerous.
And if there were ghosts-
There were probably monsters.
Spirits.
Demons.
So what world was this?
Ancient Japan.
Ghosts.
Possibly yokai.
His mind cycled through possibilities.
Shōnen Onmyōji.
Inuyasha.
Nura: Rise of the Yokai Clan.
Nura involved ancient times too, despite starting in modern Tokyo.
The memory of Nurarihyon fighting Hagoromo Gitsune in Kyoto surfaced.
There was also Noragami.
But that seemed unlikely.
So far, every time Emiya entered an anime world, it was near the start of the story.
Not far into the past.
That made Nura a poor fit.
Guessing was pointless.
He would ask.
With a plan decided, Emiya emerged from hiding and followed the path the man in red had taken.
He intended to ask him where this place was.
Not long after, he caught up.
But the man in red was already dead.
And the one who killed him-
Was not human.
It was a massive monster, its body covered in countless arms.
The moment Emiya saw it, recognition hit.
This creature was unmistakable.
The Hand Demon.
The same one that nearly killed Tanjiro Kamado.
So that was it.
All his earlier speculation was wrong.
This wasn't Shōnen Onmyōji.
Not Inuyasha.
Not Nura.
This was Demon Slayer.
Thinking about it carefully, the Demon Slayer world wasn't simple at all.
First, it had ghosts.
That was already proven.
Tanjiro himself had trained with the spirits of Sabito and Makomo.
They helped him split the boulder.
They laid the foundation for defeating this very demon.
Second, demons here possessed Blood Demon Arts.
The variety was absurd.
Elemental manipulation.
Dream invasion.
Body division.
Physical enhancement.
Even space manipulation.
Teleportation.
Calling this world low-tier would be a lie.
Take Muzan Kibutsuji as an example.
He didn't become a demon due to a curse.
Nor divine punishment.
Nor the wrath of some peerless expert.
He took medicine.
An incomplete one.
Muzan had been born weak.
He wouldn't live past twenty.
A doctor created a medicine for him.
But its side effects made Muzan think he was dying faster.
So he killed the doctor.
Later, he realized his mistake.
His body became healthy.
Immortal.
Aside from sunlight and a taste for human flesh, he had no real flaws.
That was when he became the progenitor of all demons.
After searching the doctor's notes, he discovered the truth.
The medicine was incomplete.
It lacked one ingredient.
The Blue Spider Lily.
Only the doctor knew where it grew.
And how to cultivate it.
If Muzan had been calmer-
If he hadn't killed the doctor-
He might have completed the medicine.
A true immortal.
Unafraid of the sun.
The idea that a single medicine could create such an existence was absurd.
Because of that, Emiya came to one conclusion.
This world-
Was far more dangerous than it appeared.
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