SCP-049 the Plague Doctor: Nezuko Has Contracted the Plague-She Must Be Treated!
"We discovered that a species called 'demons' exists in the Demon Slayer World!"
"They feed on humans. They're an utterly evil species."
Dr. Kuroto paused, then continued, "Of course, according to Dr. Calvin's observations, demons aren't particularly strong in combat!"
"Even their progenitor, Muzan Kibutsuji, is only about as powerful as a first-generation divine body."
"And they have a fatal weakness: sunlight!"
"Expose them to sunlight, and even Muzan Kibutsuji will turn to ash."
Everyone in the livestream froze at Dr. Kuroto's words. They had expected the Demon Slayer World to be dangerous.
But its strongest fighter was only on par with a first-generation divine body.
And demons had such a glaring weakness.
Forget the Angel Civilization, the Underworld Civilization, and the Demon Civilization—powers at the pinnacle of the Super God Universe. Even the various Indigenous Worlds...
...were confident they could wipe out the demons.
Of course, they also knew that if the Myriad Races Livestream and the SCP Foundation took the Demon Slayer World this seriously,
it could not be as simple as it appeared.
An unknown danger had to be lurking beneath the surface.
As the powerful figures from various worlds in the livestream frowned and pondered what the Demon Slayer World's true danger might be, Dr. Kuroto spoke again:
"When Dr. Calvin used Containment Object SCP- to observe the Demon Slayer World,"
"He was astonished to discover that this low-level world actually possessed the concept of reincarnation."
"That put Dr. Calvin on alert.
"Ordinarily, low-level worlds have no concept of reincarnation unless it formed when the world was born, as it did in the Soul Society World where Aizen resides and the Ninja World where Hiruzen Sarutobi lives!
"But even then, their reincarnation systems are incomplete!"
Dr. Kuroto paused, then continued, "The Demon Slayer World's reincarnation system, however, is remarkably complete.
"If the Demon Slayer World becomes fully connected to the Super God Universe,
"the Super God Universe will most likely acquire the concept of reincarnation under its influence.
"Dr. Calvin predicts that an unknown Containment Object is likely responsible. The emergence of demons as a species
"also appears to have been caused by SCP-610. Strangely, though, their symptoms are completely different from those in our records!
"So we still can't determine the cause of the Demon Slayer World's transformation. Dr. Calvin's conclusion is that SCP-610, The Flesh That Hates, and an unknown Containment Object worked together to bring it about!
"And if even a single particle enters the Super God Universe,
"the Super God Universe will be contaminated.
"After deliberation, the Foundation has decided that no one who enters the Demon Slayer World may return to the Super God Universe without authorization.
"Otherwise, the SCP Foundation reserves the right to erase them from existence by any means necessary!"
Everyone in the livestream was stunned. They had braced themselves, but none had imagined it would be this serious!
The transformation had been caused by two Containment Objects acting together.
Worse, even the SCP Foundation had no information on one of them.
Add SCP-049, the Plague Doctor, and that tiny Demon Slayer World held three Containment Objects. The danger was obvious.
That warning put off most of those who had planned to enter the Demon Slayer World and explore it.
Of course, some people refused to heed warnings.
A few stubborn souls still intended to investigate. They firmly believed the SCP Foundation was saying all this to keep the benefits of exploring the Demon Slayer World for itself!
[Monkey D. Dragon: I've ordered every member of the Revolutionary Army to stay out of the Demon Slayer World! But those Celestial Dragon scum will definitely ignore the warning!]
[Sengoku: The Three Admirals and I submitted a request to the Five Elders, but we haven't received a reply yet!]
[Whitebeard: Sengoku, you already know the answer, don't you?]
[Tatsumaki: @Monster King Orochi, keep your monsters under control. Otherwise, our world could be destroyed because of this.]
[Monster King Orochi: Too late. Meow-Meow has already taken a monster army into the Demon Slayer World!]
[Blast: @Monster King Orochi, you deserve to die!]
[Hiruzen Sarutobi: The Five Great Ninja Villages have agreed that none of us will enter the Demon Slayer World. @Pain, keep your Akatsuki in line!]
[Pain: Akatsuki won't enter either. I can't speak for the other ninjas.]
[Ying Zheng: Six Kingdoms Remnants, take my advice: don't play with fire unless you want to get burned!]
[Zhang Liang: @Ying Zheng, First Emperor, you'd better keep the Net of Heaven in line too!]
[...]
Just then, Dr. Kuroto spoke again. "According to Dr. Calvin's latest report, SCP-049, the Plague Doctor, has indeed entered the Demon Slayer World!"
"Now watch the live feed to see the dangers of the Demon Slayer World for yourselves."
With that, Dr. Kuroto's somewhat gaunt figure gradually faded from the livestream, replaced by a snow-covered mountain.
A line of small text appeared in the upper-right corner: [Demon Slayer World * Mount Kumotori].
Then the view shifted!
A boy with dark red hair and red eyes, wearing a green checkered haori, was sprinting toward the town at the foot of the mountain with a girl on his back.
Right in his path stood SCP-049, the Plague Doctor, in a black robe and crow mask.
The sight of SCP-049 made everyone's pupils contract.
The SCP Foundation really is reliable.
It had said SCP-049 had gone to the Demon Slayer World, and there he was. At the same time, everyone began to wonder:
Could the SCP Foundation have deliberately placed SCP-049 in the Demon Slayer World,
just as it had done with SCP-096, Shy Guy?
Perhaps it wanted to investigate the truth about that world while conducting an interaction experiment.
The more the viewers thought about it, the more likely it seemed. From what they knew of the SCP Foundation's methods,
this was exactly the sort of thing it would do.
In the live feed, the red-haired boy had reached SCP-049. When the Plague Doctor made no move to step aside,
the boy shouted anxiously, "Move!"
"I need to find a doctor in town!"
"Get out of my way!"
At the boy's words, SCP-049, the Plague Doctor, raised his head and looked at him. "Young man, you're looking for a doctor?" he asked in a raspy voice.
"What a coincidence."
"I am a doctor. May I examine the girl's injuries?"
The red-haired boy froze at SCP-049's words, then stopped and eyed the strangely dressed figure with suspicion.
Is this person really a doctor?
He had lived on Mount Kumotori for over a decade. He had never seen this person before, much less heard of him.
Strangely, though, he sensed no hostility from him.
Under normal circumstances, Tanjiro might have refused. But Nezuko's breathing was growing fainter, until he could barely detect it.
At this rate,
she would never last until they reached town. After weighing his options, Tanjiro decided it was worth a try and accepted SCP-049, the Plague Doctor's offer.
He let him examine his younger sister, Nezuko.
After all, the person before him might be dressed strangely, but he showed no hostility.
What if he can save Nezuko?
At the sight, countless viewers' pupils contracted sharply!
SCP-049, the Plague Doctor: Nezuko Is Infected with the Plague and Must Be Treated!
Meanwhile!
On a bustling street in Tokyo, in the Demon Slayer World,
a Void Passage appeared out of thin air. A Cat Person walking on two legs emerged with a group of monsters while the surrounding crowd stared in shock!
After a brief stunned silence, the crowd erupted into panic!
"A monster!"
"Run! They're monsters!"
"Help! Monsters! Run!"
"..."
Meow-Meow watched the people scatter. He stuck out his blood-red tongue and licked his claws, which glinted in the morning sun, then smiled cruelly:
"No pesky Hero Association here!"
"Finally, we can kill without holding back!"
"Kill!"
"Let blood and screams announce the Monster Association's arrival in the Demon Slayer World!"
As he spoke, Meow-Meow flicked his claws. The people within several hundred meters were sliced into chunks of flesh. Then he speared a heart on one claw!
He put it in his mouth and chewed, his face filling with delight. "Delicious. You should try some too!"
At Meow-Meow's command, hundreds of monsters surged away in every direction.
A slaughter began!
In moments, all of Tokyo was engulfed in violence, filled with screams, explosions, and the monsters' excited roars!
Seeing this in the livestream, Tatsumaki immediately posted: [@Monster King Orochi, you deserve to die! You'd better get ready, because you're next!]
[The Hero Association won't let you off this time!]
[Let's go to war!]
[And we won't stop until one of us is dead!]
Monster King Orochi fired back: [Natural selection. Survival of the fittest. That's the way of the world! We monsters were born of the world's will.]
[We're a more advanced species than humans.]
[If you want war, you'll have it!]
Seeing their messages, Whitebeard couldn't help posting: [@Tatsumaki, if the fighting goes badly, the Whitebeard Pirates can back up the Hero Association!]
[Tatsumaki: @Whitebeard, no need, old man. The Hero Association isn't afraid of some Monster King Orochi!]
[Monster King Orochi: Big words!]
Mount Natagumo, Demon Slayer World!
Led by their captain, Lucci, a group of Cipher Pol Aigis Zero agents crossed the Void Passage and arrived on Mount Natagumo. Then they activated their Observation Haki...
Once they found Lower Rank Five Rui's lair,
they used Soru and shot into the air, heading straight for it!
On the Celestial Dragons' orders, they had not started a livestream. Instead, they sent everything they encountered in the Demon Slayer World to the Five Elders through private messages.
At a Demon Slayer Corps Outpost in the Demon Slayer World!
"Captain, leave it to me!"