Screen 1 – The Swamp Demon
After Final Selection, Tanjiro, Sans, and Papyrus march toward their first mission.
The wind feels colder than before—as if the mountain left its curse on them.
A crow lands on Tanjiro's shoulder.
"NORTH TOWN. YOUNG WOMEN VANISHING. BLOOD TRAILS FOUND."
Sans sighs. "…Figures."
Papyrus clenches his fists. "Young women disappearing!? Then justice must be served immediately!"
They arrive at the quiet town.
No noise.
No children.
The streets look abandoned.
A terrified mother leads them into her home.
Her hands shake so hard she can barely speak.
"My… my daughter. She was taken. Dragged into the ground. I heard the screams—please—please save her…"
Tanjiro closes his eyes, breathing in deeply.
He smells it.
Fear. Mud. Rot. The scent of a demon hiding just beneath their feet.
Before he can warn her—
the floor bulges.
A pale, mud-soaked arm shoots upward.
Papyrus shouts, "DEMON ATTACK!"
Sans mutters, "…knew it."
Three figures drag themselves out of the ground—identical bodies, eyes sunken, skin stretched tight like wet paper.
Mud drips from their jaws.
The Swamp Demon has already split into clones.
Tanjiro draws his blade.
Papyrus summons a bone barricade.
Sans teleports to the side.
The first clone sprints for Tanjiro.
Its claws slice the air where Tanjiro's face was just a second ago.
The second slips back into the earth.
The third leaps for Papyrus, shrieking.
Papyrus meets it head-on, bone hammer materializing in his hands.
CRACK.
The demon flies backward.
"BEGONE, VILE BRUTE!" Papyrus roars.
But the second clone erupts from the ground beneath Sans, claws aimed for his spine.
Sans glances down.
"…nah."
His eye flashes blue.
Gravity crushes the demon into the dirt, snapping its limbs with hideous cracks.
Tanjiro's blade slices through the first clone's neck.
Mud sprays across his face like blood.
Papyrus's hammer caves in the third clone's ribs.
The mud writhes.
The bodies reform.
Sans dusts off his hoodie. "Yeah, they're not done."
The ground below them begins liquefying.
Tanjiro tightens his grip. "He's pulling us in."
Papyrus flails. "WAIT, NO—NOT INTO THE FILTHY UNDERGROUND DIMENSION—"
The floor cracks open beneath their feet.
Sans smirks. "Welp. Field trip."
The swamp drags them down.
---
Screen 2 – Inside the Swamp
Cold pressure crushes their lungs as they sink.
Tanjiro's ears ring.
Papyrus screams the entire way down.
They hit the bottom of the Swamp Demon's realm—a hellish void swirling with purple sludge and bones from countless victims.
Broken lanterns float like lost souls.
Claw marks stain every surface.
Papyrus trembles. "This decor is ILLEGAL!"
Three shadows circle them.
Fast.
Relentless.
The clones strike with murderous fury.
The first slashes Tanjiro's arm.
Blood sprays into the void.
The second tries ripping through Papyrus's spine.
Papyrus whirls his spinning bone shield, deflecting blow after blow.
"YOU SHALL NOT PENETRATE MY SPINAL DEFENSES!"
The third lunges at Sans — jaws wide, teeth needle-sharp.
Sans dodges lazily. "Cute."
He flicks his wrist.
Gravity explodes outward.
For the first time, the swamp itself shudders.
The demons slow—but only for a heartbeat.
Tanjiro sees the pattern.
"Papyrus! On my mark—right side!"
Papyrus leaps, bone spear forming in his hand.
He impales the rightmost clone, bones cracking as the creature bursts into mud.
Tanjiro slashes the second clone's neck clean through.
The head hits the swamp floor with a wet thud.
The final clone shrieks and flees deeper into the void.
Sans snaps his fingers.
The space around the demon bends.
A gravity wall slams down, crushing the demon flat to the ground.
Its bones—or whatever passes for bones—snap loudly.
Tanjiro finishes it.
"Water Breathing… Sixth Form!"
His blade cuts the final neck in one clean, merciless sweep.
The entire dimension crumbles.
Screams fade.
Bones sink into the mud.
Reality collapses.
---
They land on solid earth again—covered in blood, mud, and demon rot.
Papyrus strikes a heroic pose despite being covered in swamp filth.
"ANOTHER GLORIOUS—DISGUSTING—BUT GLORIOUS VICTORY!"
Sans sits down instantly. "I'm takin' a nap."
Tanjiro wipes the blood from his face.
His eyes soften as he sees the mother's house.
"…One more family saved."
But his heart feels heavier than before.
The swamp smelled like death.
Like the past demons he failed to save.
Like Nezuko's blood in the snow.
Sans looks at him quietly.
"You okay, kid?"
Tanjiro forces a smile.
"Yeah. We just… have a lot more demons to fight."
Be continued