Drip… drip…
The crisp sound of liquid hitting the ground echoed clearly in the silent alley.
A thick, nauseating smell of blood filled the air.
Bright red liquid quickly spread across the ground.
In the dark environment, the sticky blood made the place look like a scene straight from hell.
The red-haired man and the brown-haired woman still seemed unable to process what had just happened.
They stared blankly at the horrifying sight before them.
Crunch… chew…
The sound of tearing and chewing came from the monstrous mouth formed from Mammon's arm.
Mammon looked expressionlessly at the half of the blond man's body that remained.
"…The taste is terrible."
Mammon frowned slightly and controlled the flesh-monster to spit out the body.
Although he had become a demon—and demons naturally fed on human flesh—
For some reason, whether because of psychological reasons or simply because the blond man was trash, Mammon felt intense disgust toward his flesh.
At that moment, the red-haired man and the brown-haired woman finally regained their senses.
They stared at Mammon in pure terror.
"Y-you… you're a monster!"
The red-haired man trembled violently with fear as he pointed at Mammon.
The alcohol in his system vanished instantly.
Humans in this world could evolve and gain powers.
But nothing could be this grotesque and evil.
Only monsters.
The brown-haired woman was even worse—she was so terrified she couldn't say a single word.
Fear had completely consumed her mind.
"Monster?"
Mammon lowered his eyelids and glanced at the red-haired man.
"I'm not a monster."
The monstrous mass of flesh that his arm had turned into suddenly shot forward toward the red-haired man.
CRACK!
A bone-shattering sound rang out along with the man's agonized scream.
The sickening sound of bones breaking and blood splattering echoed through the alley.
The brown-haired woman collapsed helplessly onto the ground.
She wanted to run.
She desperately wanted to escape.
But her body wouldn't move at all.
Pure fear had robbed her of all strength.
Tap… tap…
Soft footsteps echoed clearly in the quiet alley.
"N-no… please… don't…"
The woman looked up.
The pale-faced boy was slowly approaching.
Tears streamed down her face as her instinct to survive forced those words from her mouth.
"I want to ask you something."
Mammon crouched down in front of her.
His cold crimson eyes stared directly into hers.
"Do I look half-dead?"
The woman shook her head frantically.
Tears continued to flow as her fear became overwhelming.
Mammon watched her trembling in terror.
A dark smile slowly spread across his face.
He raised one hand and extended his index finger.
His fingernail rapidly grew longer, becoming sharp like a blade.
"My blood… can make people evolve."
Mammon reached toward the woman.
With a sharp shhkk sound, the razor-sharp nail pierced straight into the center of her forehead.
The woman's face twisted grotesquely in pain.
"But what would happen…"
"If I gave you a large amount of my blood?"
Mammon withdrew his hand and slowly stood up, looking down at her as her face began to change drastically.
The woman's pupils expanded in terror.
Purple veins spread densely across her body.
At the same time, her body began swelling uncontrollably.
"Your cells will collapse."
"They cannot withstand the speed of the mutation."
Mammon watched the horrifying transformation calmly.
BOOM!
In the end, the woman's body could not endure the mutation.
Her entire body melted into a pile of flesh.
Mammon simply watched.
He had just killed three people.
Yet his emotions remained completely calm.
It felt no different from crushing three filthy rats.
He also wasn't worried that what had happened here would cause him trouble.
Because this world was already one where the strong devoured the weak.
Crime and evil filled every corner of the world.
Mammon felt no guilt at all for eliminating such trash.
"Hm?"
Just as he was about to leave, he noticed something.
Mammon looked toward where the woman's body had been.
Squeak squeak…
Several rats crawled quickly across the blood-soaked ground.
They reached the pile of flesh and began devouring it frantically.
Mammon had poured a large amount of his blood into the woman.
Her human body and talent were incapable of withstanding the mutation.
Under normal circumstances, the remaining flesh would soon disappear as the mutation continued.
But now—
These sewer rats were eating it.
"Muzan's blood… besides humans…"
Mammon watched quietly.
A trace of interest appeared in his cold crimson eyes.
In Demon Slayer, the demons created by Muzan were always humans.
But could Muzan's blood transform other creatures into demons?
No one knew.
But if the blood could turn non-human creatures into demons…
Then things would become very interesting.
Because this world was completely different from Mammon's previous life.
Several years ago, dimensional rifts opened in this world.
Since then, humans were no longer the rulers.
Creatures from other worlds had begun invading through those rifts.
Meanwhile, the three rats continued devouring the flesh without paying any attention to Mammon.
It was as if the flesh had a fatal attraction to them.
Soon—
One of the rats suddenly began convulsing violently.
Its body trembled uncontrollably before collapsing to the ground.
At the same time, bloodshot veins rapidly spread across its eyes, creating a terrifying sight.
Then its entire body began swelling rapidly.
In the blink of an eye, the rat had grown to the size of a hyena.
Mammon narrowed his eyes slightly.
"…It seems."
"The effect is working."