Mash-up Anime World: Creating the SCP Foundation to Contain Anomalies

T/N: For those who want to see a character illustration of Kanako.

(Here)

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Staring at Muzan inside the containment box, the members of the Demon Slayer Corps were seething with rage.

At this moment, all nine Hashira had gathered.

Each of them bore an unrelenting hatred toward this unforgivable Demon. Right now, they wished for nothing more than to tear him apart limb by limb.

However, as Muzan looked at the Demon Slayers before him, an inexplicable sense of familiarity and… relief surfaced in his heart.

Compared to that damned Foundation, the Demon Slayer Corps actually felt comforting!

It was like being in a war where both sides were exchanging gunfire, and then suddenly, an antimatter strike obliterated the battlefield.

In that moment, didn't your original opponent seem much more lovable compared to an unstoppable, god-like force?

"Thank you, Foundation, for your assistance. Now that Muzan has been subdued, we can finally die without regrets."

As the representative of the Hashira, Kanae stepped forward and bowed deeply to Levi and his team.

Even though they wanted nothing more than to kill Muzan themselves, the Hashira understood that the Foundation needed him for their experiments. For now, he couldn't be executed.

Besides, when they thought about it, being subjected to endless experiments might be a fate far worse than death.

Levi simply waved a hand, indicating there was no need for such gratitude.

At that moment, Kanako stepped up beside Kanae.

"That damn president told me before we left that once the mission was over, I should invite the Hashira and your master to join the Foundation."

Kanae was momentarily stunned.

Not because of the invitation, but because of Kanako's wording.

Damn president?

Behind her, Shinobu smirked and muttered under her breath, "See? Even his own subordinates call him that. It's not just me who thinks that guy is terrible."

As the news of Muzan's capture spread, Shinobu activated the multiversal chat group's video feed.

Muzan was the root abnormality of this world, the ultimate enemy of the Demon Slayers.

Now that he had finally been defeated, though in a rather bizarre manner, it was still a moment worth witnessing.

Inside the multiversal chat group, the reactions were… lively, to say the least.

Pain Magnet: "I can't stop laughing. Why does Haruto have two completely different faces?"

Blonde Defeated Dog: "That's just workplace gossip! It's normal for employees to complain about their boss—it doesn't mean it's true!"

Hall Master of Wangsheng: "Eriri, you do realize that Haruto can't see your comments here, right?"

Spoilers Are Fun: "@Hall Master of Wangsheng, if Boss Haruto could see them, Eriri probably wouldn't be talking so freely."

Big Sister is Supreme: "Just another tsundere, that's all."

Blonde Defeated Dog: "Emotionless girl!"

Pain Magnet: "Seems like no one actually cares about Muzan, huh?"

While the chat group descended into "harmonious" chaos, the leader of the Demon Slayer Corps, Ubuyashiki Kagaya, finally arrived.

He walked swiftly toward the group and caught sight of the utterly defeated Muzan.

Muzan, in turn, also spotted Kagaya.

Once, Muzan had racked his brain trying to find a way to kill Ubuyashiki, considering him a thorn in his side.

But now, upon seeing him, Muzan nearly burst into tears.

He struggled to move his body toward the edge of the containment box and looked at Ubuyashiki as he spoke.

"Hey, human! You Demon Slayers were so desperate to kill me that you resorted to using these devils' power? All I wanted was to become a perfect being! I simply wished to be without flaws! Why must this world be so cruel to me?!"

(T/N: Do some moonwalk Michael.)

Hearing this, Kagaya froze, and the Hashira were equally dumbfounded.

Was this bastard seriously playing the victim now?

Of all people, Muzan was the least qualified to talk about how cruel the world was!

Kagaya's expression flickered with anger for a moment, but he quickly regained his usual calm.

"Muzan, we did not borrow the power of other beings, we merely received the help of our allies. As for you, you slaughtered the innocent without remorse, seeking evolution at any cost. The fact that you are alone now is nothing more than your just deserts."

Upon hearing this, Muzan howled in disbelief.

"Impossible! Those creatures cannot be human!"

To him, they were crimson demons, monsters that had crawled up from the depths of hell.

Otherwise, how could they possess red armor and effortlessly bring him to his knees?

Watching Muzan scream in fear, completely ignorant and powerless…

the Demon Slayer Corps, Kagaya and the Hashira's included, felt an overwhelming sense of satisfaction.

Even greater than what they would have felt by killing him.

To see that monster, who once slaughtered humans at will, tremble in fear...

It was incredibly gratifying.

Ignoring Muzan, Kagaya turned to the members of Wings of Freedom. He truly wanted to express his sincere gratitude to these people, to the Foundation.

To be honest, the Demon Slayer Corps had been fighting Muzan for centuries.

Generations had struggled, yet Kagaya could never see a path to victory.

However, the Foundation's arrival was like the rising sun, dispersing all the darkness and doubt.

Just as he was about to express his gratitude, Kanae approached him.

"Master, Lord Haruto has invited us to join the Foundation."

Kagaya was taken aback for a moment before laughing softly.

"I was already a man with no future, yet Lord Haruto extended my life and even allowed me to witness a dream I never dared to imagine. Not to mention repaying this debt, if I were to stop now, I wouldn't know what to do with myself. Since Lord Haruto sees value in me, I shall accept the invitation.

However… my children, you must decide for yourselves. Muzan is gone, and the world no longer needs the Demon Slayer Corps."

Though Kagaya had no hesitation in joining, he wanted the others to think it through.

However, the Hashira's thoughts were much the same as his.

Without the Foundation's help, they wouldn't have long to live anyway.

Besides, having dedicated their lives to the Demon Slayer Corps, they suddenly had no purpose.

"We will join as well!"

"I will continue fighting for humanity!"

One after another, the Hashira pledged their loyalty.

Kanae was about to agree as well until she felt someone tug at her sleeve. Turning around, she saw her younger sister.

"What's wrong?"

Kanae asked curiously.

"Sister… don't join the Foundation. Let me go in your place..."

 Shinobu whispered.

She was still unwilling to let her sister be "taken" by Haruto.

However, Kanae firmly shook her head.

"Shinobu, I understand your concerns. But Lord Haruto has done me a great favor, and he has done an even greater service for the Demon Slayer Corps. If I do not repay him, I will never be able to sleep in peace. Besides..."

As she thought about Haruto, an inexplicable sense of admiration filled her heart.

Seeing her sister's longing expression, Shinobu lost her mind.

"That damned president!!!"

Pain Magnet: "Forgive me for laughing, but it seems like Shinobu's sister has a thing for Haruto..."

Blonde Defeated Dog: "Hmph! It's just that Haruto is too kind, and now he's attracted a butterfly!"

Spoilers Are Fun: "Tsk tsk, from the moment I saw Haruto, I knew he had the aura of a protagonist..."

Hall Master of Wangsheng: "By the way, isn't the group missing two people? Where's the Doctor and the Admin?"

Portal Daddy: "Saving the universe."

Candle Dragon, Fate's Master, Lord of Knowledge: "Saving the world."

Pain Magnet: "!"

While Doctor Strange was presumably busy saving the universe, Haruto was quietly watching the chat.

Originally, he had just wanted to check the progress of the Demon Slayer world through the chat group.

He hadn't expected to stumble upon gossip about himself again.

Indeed, keeping his identity under wraps had been the right move.

Otherwise, he wouldn't have been able to enjoy this.

At that moment, Wings of Freedom had already begun escorting Muzan through the portal.

Haruto quickly snapped out of his idle amusement, straightened his attire, and prepared for action.

Before long, a message from the Foundation arrived, and he headed toward the light containment level.

[Successfully contained anomaly: Root—Demon King Muzan.]

[Anomaly classification: Level 4 - Destruction. Containment level: Excellent.]

[Reward: One Level 4 lottery draw.]

[Congratulations, host, for containing the root anomaly of the Demon Slayer world, successfully sealing all abnormal occurrences within this world.]

[The Demon Slayer world is now eligible for a permanent portal link to the main world.]

[Reward: A fragment of World Energy.]

As a series of notifications rang out, Muzan was completely secured.

But Haruto wasn't particularly interested in him. Instead, he approached the members of the Demon Slayer Corps with a smile.

Everything proceeded smoothly, Kagaya and the Nine Hashira all joined the Foundation.

The Nine Hashira, along with elite members like Kotaro and the newly recruited Tanjiro, were designated as members of the new Mobile Task Force.

Mobile Task Force—Demon Slayer.

Meanwhile, Kagaya, after extensive training, would become a member of the O5 Council, assuming the role of O5-3, contributing to the Foundation's decision-making process.

Like Erwin's strategic brilliance, Kagaya's foresight was invaluable to the Foundation.

With the Demon Slayer Corps settled, Haruto wasted no time in grabbing Kanako and dragging her away.

The girl barely had time to let out a pitiful whimper.

"My hotpot!"

And then she was gone.

After pulling Kanako into a secured chamber in the high containment zone, Haruto rubbed his hands together.

It was time for the lottery!

Brimming with anticipation, he opened the system's lottery panel.

Three Level 4 draws. Two Level 5 draws.

This was going to be big!

With the press of a button, the draws began.

Starting with three Level 4 pulls to test the waters!

[Reward (Purple): Fate Entwined ×1, Predestined Encounter ×1.]

[Reward (Gold): Even If the Sunset Falls Three Times.]

Seeing the results, Haruto was dumbfounded.

"What the hell are 'Fate Entwined' and 'Predestined Encounter' supposed to be!?"

"Can I use them for another draw!?"

When he selected to claim the rewards, he suddenly found himself holding two round orbs—one blue, one purple.

"What the hell am I supposed to do with these!?"

Haruto grumbled.

Just then, the system displayed a prompt:

[Predestined Encounter: Allows you to meet a specific person.]

[Fate Entwined: Allows your fate to intertwine with another's.]

Haruto:

"..."

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I think this will gonna be a one chapter day.

I'm gonna have to attend my cousin's wedding, so the whole clan's gonna be whole again and something tells me I'm gonna wake up with a hangover.

Xiao~