The air of the new world tasted different—sharp, metallic, and ancient.Sung Jin-Woo landed lightly in the middle of a forest, boots crushing fallen leaves. His shadow rippled unnaturally on the ground, reacting to the leftover mana of the dimensional tear.
He raised his head and listened.
Screams. Explosions. Roaring.
Not from monsters he recognized. Something else.
Jin-Woo clicked his tongue."No rest as usual, huh?"
He sprinted—not rushed, but so fast that the world blurred around him.
Scene Shift – The Battlefield
A small village lay in ruins. Houses ripped apart, tiles scattered, bodies trembling in fear. At the center, a monstrous figure stood — Zohakuten, one of Muzan's strongest forms, with multiple wooden dragon heads swirling around him like a storm.
And among the rubble, fighting alone—
Love Hashira, Kanroji Mitsuri.
Her hair stained with dirt and blood, arms trembling, but her eyes still filled with determination.
"IF YOU THINK YOU CAN HURT ANYONE WHILE I'M STILL BREATHING—I WON'T LET YOU!"
She dashed forward, her pink whip-like blade cutting through one wooden dragon — only for two more to emerge, slamming her into the ground.
Zohakuten laughed coldly."Your love is worthless against justice. You are weak."
Mitsuri stood again—barely.
And then—
One of the wooden dragons tore from the ground and swallowed her whole.
Her scream echoed inside the wooden fangs, fading instantly.
The villagers collapsed to their knees."It's over…""The Hashira is gone…"
A Voice That Shook the Battlefield
"No."
The tone was calm — too calm.
Even Zohakuten turned.
A man walked toward him, dressed entirely in black. Boots silent. Eyes glowing with the cold ferocity of a king accustomed to killing gods.
Sung Jin-Woo.
The wooden dragon that swallowed Mitsuri began chewing, tightening—
Jin-Woo vanished.
Not teleported — he moved faster than sight.
💥 CRACK!The dragon's head flew into the air — sliced perfectly.
Jin-Woo's right hand held an ominous crimson blade — the Demon King Dagger.
Before the other dragons could react, Jin-Woo blurred into motion again.
One head. Two. Three. Four.Each slash sounded like thunder splitting the earth.
Within seconds — all wooden heads lay on the ground, twitching but decapitated repeatedly so they couldn't regenerate.
The last one fractured open, and Mitsuri fell out — breathless, but alive.
She landed right in Jin-Woo's arms.
Mitsuri blinked, confused, then focused on the face of the man holding her — unbelievably handsome, with an aura so intense it made her heart skip.
"U-Ummm… T-thank you…" she whispered, cheeks pink.
Jin-Woo gently set her down.
"You're safe now."
Mitsuri's face turned RED.
"OH MY GOD—HE'S SO COOL—WAIT NO THINK PROFESSIONAL MITSURI THINK PROFESSIONAL—!!"She covered her face and waved her arms in panic.
Jin-Woo blinked slowly."…Are you okay?"
"I-I'M FINE!! I JUST HAVEN'T BEEN PRINCESS-CARRIED BY A STRONG MYSTERIOUS GUY BEFORE— OKAY THAT SOUNDS WRONG— AHHHHH!"
Jin-Woo coughed softly and turned away, pretending he didn't just hear all that.
The severed wooden necks exploded with new growth.
"You… YOU DARE INTERFERE IN MY JUSTICE?!"
Zohakuten roared, transforming the battlefield into a nightmare.Dragons emerged by the dozens, hundreds — filling the sky like an army of serpents. Villagers fell, Mitsuri prepared to fight again even though her body shook.
Zohakuten pointed at Jin-Woo.
"I don't know who you are, but you shall be JUDGED!"
Jin-Woo shrugged.
"Sorry. Someone already judged me once. I didn't like the result."
He raised his hand.
The ground darkened instantly. Shadows rippled like living oil.
A deep, insectoid roar shook the area.
From the shadow crawled out a towering beast — tall, black-armored, with wings tucked behind its back and glowing green eyes filled with loyalty and bloodlust.
Beru.
The former ant king bowed.
"MY LIEGE. WHO SHALL I SLAUGHTER?"
Every dragon in the sky froze.Even Zohakuten trembled — sensing something purely predatory.
Jin-Woo pointed forward casually.
"Everything that moves."
Beru let out a scream of joy.
"AS YOU COMMAND!"
And then the massacre began.
Beru shot into the sky with impossible speed, shredding the first dragon head mid-flight. The force of the kill sent shockwaves across the village. His claws ripped through wood like paper, his wings beating so hard they toppled debris.
Villagers watched speechlessly as the dragons were not defeated — they were erased.
Mitsuri stared, jaw hanging open.
"H-He… He summoned a stronger thing than the Upper Moon itself…?"
Meanwhile — Korea, Hunters Association
Alarms blared.
Chief Woo Jin-Chul stared at the swirling 3-D display.
"The Gate… It's changing shape. It's not mana anymore — it's something unknown."
Cha Hae-In gripped the table.
"Is Jin-Woo okay inside?"
Jin-Chul swallowed.
"We have no way to know. The Gate doesn't register signals, doesn't send energy readings—nothing."
Another hunter ran in.
"Chief! S-sir! The Gate just absorbed our probes, destroyed the drones, and the magic barrier isn't holding—"
Jin-Chul slammed his fist into the desk.
"We made a mistake sending him alone."
Cha Hae-In whispered:
"If something can threaten Jin-Woo… then what kind of world is he fighting in…?"
Back in the Demon Slayer World
Zohakuten staggered back, bleeding rage instead of fear.
"You… cannot defeat me! I am immortal! Until my original body falls, I will regenerate forever!"
His wooden flesh surged again — regenerating even the destroyed dragons. Beru roared and slashed, but no matter how many times Zohakuten was split apart, he formed again, laughing in arrogance.
"You are powerful, Shadow Monarch! But you cannot kill what has no true body!"
Jin-Woo narrowed his eyes.
Main body? Someone else?
Before he could ask, Zohakuten suddenly convulsed — eyes bulging in shock.
"W-wait— NO!! HE FOUND HIM—!!"
The wooden body began to crack — splinters flying outward.
"THE MAIN BODY— HAS BEEN DECAPITATED—!!"
A bright crimson light burst through Zohakuten's chest.His body caved in like a collapsing building — wooden dragons falling apart mid-air and turning into dust.
Villagers shielded their faces as the force swept across the battlefield.
Zohakuten screamed, not in pain — but in complete disbelief.
"THAT BRAT… TANJIRO… DAMN YOU!!!"
With one final blast of spiritual pressure, the body of Zohakuten disintegrated into ash, scattering into the wind.
Silence returned.
The villagers collapsed crying in relief. Beru landed beside Jin-Woo, confused.
"M-MY KING… THE ENEMY WAS NOT KILLED BY ME. IT PERISHED ALONE."
Jin-Woo stared at the fading ashes.
"…Someone else killed it."
Mitsuri struggled to her feet."It… it must have been Tanjiro and his team. They were chasing the real Hantengu — the original body."
Jin-Woo turned to her.
"Explain."
Mitsuri took a breath, still exhausted.
"Hantengu wasn't just one demon. All the clones — including Zohakuten — are split emotions from the real body. No matter how many times you kill this one, they'll regenerate forever unless someone kills the original Hantengu."
Jin-Woo lowered his blade, thinking.
"An immortal army unless you kill their source… So these aren't normal monsters."
Mitsuri nodded weakly.
"Upper Moon demons… the elite of Muzan's army. They're not like normal demons. They heal… evolve… multiply… and fight like nightmares."
Just then, distant explosions echoed across the mountains — the sound of Tanjiro and Nezuko's battle ending.
Jin-Woo looked toward the sound.
"So that boy saved this battlefield without even being here."
Mitsuri smiled softly.
"Tanjiro… he always protects everyone… even if he's bleeding."
Jin-Woo remembered Jin-Ah watching Demon Slayer on TV.
"Rengoku protects everyone even when he's hurting."
Maybe, in this world, Tanjiro was that kind of person.
Jin-Woo sheathed the Demon King Dagger.
"Let's go find him."
Mitsuri's face turned bright pink instantly.
"W-wait— together..?!"
Jin-Woo offered his hand to help her stand.
"Until all of you are safe, I'm not leaving."
Mitsuri grabbed his hand — not just blushing this time, but smiling with pure relief.
"Then… welcome to our world, Sung Jin-Woo."
Beru let out an excited roar behind them.
And somewhere far away, the scent of Muzan's fear spread.