The One Punch Man (a.k.a Saitama) in Demon Slayer

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A chilling wind swept through the mountain village of Shiranomura, carrying an eerie silence that was unnatural even for the dead of night. The usual sounds of crickets and rustling leaves had vanished, replaced by an unsettling stillness.

Then, the ground trembled.

At the heart of the village, a massive rift split open, glowing with a deep crimson hue. The air around it distorted, as if reality itself was being torn apart. A dark gateway stood tall, adorned with strange runic symbols pulsating with ominous energy.

A Beast Gate had appeared.

The villagers, unaware of the terror about to unfold, gathered near the anomaly, whispering in fear and curiosity. But before anyone could react—they emerged.

From the swirling darkness of the gate, beasts unlike anything seen before stepped into the mortal realm. Their bodies shimmered with a mixture of scales, fur, and armor-like exoskeletons. Some resembled monstrous wolves with glowing red eyes, while others stood upright, humanoid yet beastly, their claws sharper than swords.

One beast in particular stood out.

Towering over the rest, a six-armed creature with obsidian-black skin and golden tribal markings let out a deafening roar. Its serpentine eyes glowed like molten gold, and its jagged teeth gleamed in the moonlight. It could speak.

"Humans… pathetic, weak creatures… your era ends now."

In an instant, chaos erupted.

The beasts rampaged through the village, tearing apart homes, devouring livestock, and leaving destruction in their wake. Screams filled the night air as people ran, desperately seeking shelter.

Meanwhile, at the Demon Slayer Headquarters…

A crow flapped its wings frantically, landing on Master Ubuyashiki's shoulder. Its voice was urgent:

"Emergency! A never-before-seen phenomenon! A demonic gate has opened, unleashing unknown creatures! Shiranomura is under attack!"

The Hashira, who had gathered for a strategy meeting, immediately froze.

"A gate? Not a demon attack?" Rengoku's voice burned with curiosity.

"They are not demons," Giyu said, frowning. "But this sounds like a much greater threat."

Shinobu crossed her arms, her expression dark. "Creatures that can fight in daylight? If this is true, we may not be able to rely on the sun to defeat them..."

Muichiro's sharp gaze met Ubuyashiki's. "Master, should we move out?"

Ubuyashiki nodded solemnly. "Send the Hashira. We must see these creatures with our own eyes and understand what we are dealing with."

And so, the strongest warriors of the Demon Slayer Corps set out toward the unknown, unaware that this was only the beginning of something far more terrifying than Muzan's demons.

Back at Shiranomura…

A single figure stood in the middle of the burning village, unfazed by the carnage.

With his cape fluttering in the wind, Saitama cracked his knuckles, watching the beasts with a blank expression.

"So... you guys are new?"

The six-armed beast turned its glowing eyes toward him and let out a snarl. "Who dares stand before Lord Shinkuro, the King of Beasts?"

Saitama scratched his bald head. "Hmm… never heard of you."

Shinkuro's muscles tensed with rage. "Insolent fool! You shall perish like the rest—"

BOOM.

Before Shinkuro could finish his sentence, Saitama's punch had already connected.

The massive beast disintegrated on impact. His body didn't even get a chance to react—he was simply gone.

The other beasts staggered back in horror.

Saitama stretched his arms lazily. "Ah, I didn't hold back this time... Oops."

To Be Continued…

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