Screen 1 — Boarding the Train
Just like canon: the trio — Tanjiro, Zenitsu, Inosuke — and Kyojuro Rengoku board the Mugen Train to investigate the mysterious disappearances.
The lights flicker, and the soft rumble beneath their feet hides the demonic presence pulsing deep within the cars.
When Enmu's Blood Demon Art begins to take effect, a wave of drowsiness sweeps through the train.
> Venom (growling): "Something's attacking your brain waves. Don't close your eyes."
Tanjiro (tired): "He's… putting everyone to sleep…"
Black fluid spreads across Tanjiro's eyes, forming a living blindfold.
> Venom: "Try now."
Tanjiro: "Still awake."
Venom: "Dreams can't trap two minds at once."
Result: Tanjiro remains conscious — Enmu's Blood Demon Art fails.
---
Screen 2 — Enmu's Dream Trap
Zenitsu and Inosuke fall asleep instantly, their breathing steady.
Rengoku dozes, sword still in hand, his heart calm even in dreams.
But Venom senses something slithering beneath the train.
> Venom: "He's fused with the metal. He's everywhere."
Tanjiro slices the wall — it bleeds.
> Tanjiro: "He merged with the train!"
Venom: "A train demon. Pathetic… but creative."
Venom's tendrils spread through the floor, reading vibrations like sonar.
> Venom: "Found it. The core — front carriage, below the boiler."
---
Screen 3 — Inside the Beast
The train roars. Flesh expands across the seats. Veins pulse through the metal.
Dozens of demonic arms burst from the walls, trying to grab the sleeping passengers.
> Venom: "His body regenerates faster than we can cut."
Tanjiro: "Then we burn it."
Tanjiro inhales deeply.
> Tanjiro: "Sun Breathing — First Form: Dance!"
The sword ignites in black-orange light as Venom channels energy through it, vaporizing the demonic flesh.
The entire carriage glows red-hot.
> Venom (grinning): "Now this is a furnace."
---
Screen 4 — The Core
They reach the engine room — a throbbing, beating heart fused to the machinery.
> Venom: "That's his core. One strike, and it's over."
Enmu's voice fills the walls, cold and mocking.
> Enmu: "You're all inside my dream! You can't kill what's not real!"
The floor splits, the world distorting into a blood-red sky filled with endless train tracks.
> Tanjiro (focused): "He trapped us again."
Venom: "No. He trapped himself with us."
Venom's form expands, tearing through the illusion like paper. The dream shatters — Enmu screams in agony.
> Venom: "You can't control minds that aren't human."
Tanjiro: "This ends now!"
He leaps high, sword blazing.
> Tanjiro: "Sun Breathing, Third Form — Rising Scorching Sun!"
The strike pierces Enmu's heart.
Venom devours the regenerating flesh, consuming the demon completely.
---
Screen 5 — Aftermath
The Mugen Train screeches to a halt.
The passengers wake safely. The sun rises over the horizon, washing the blood away.
> Rengoku (smiling): "Well done, Kamado! That light — it shines like the dawn itself!"
Venom: "He's loud."
Tanjiro (grinning): "But kind."
Venom hums quietly, tone almost pleased.
> Venom: "That demon was clever. I like clever prey."
Tanjiro: "You mean you liked saving people."
Venom: "…Perhaps both."
---
Screen 6 — The Upper Moon Appears
A chill runs through the clearing.
Akaza, Upper Moon Three, descends with that smooth, calm cruelty.
> Akaza: "Strong ones die young. You'll make fine demons."
Round 1:
Rengoku steps forward. Flame and fury clash with Akaza's martial arts in a blur of heat and shockwaves.
Venom watches, studying every movement.
> Venom: "He fights like lightning trapped in flesh."
Tanjiro: "And he's killing himself doing it."
Round 2:
Akaza lands behind them — faster than light. Venom's senses flare.
A tendril snaps out, intercepting Akaza's strike mid-motion, shattering his arm.
> Akaza (grinning): "Interesting. You're not human."
Venom: "Neither are you."
Round 3:
Rengoku's chest is pierced — but Venom moves instantly, sealing the wound with symbiote flesh, stopping the bleeding.
> Rengoku (breathing hard): "Kamado… this power—"
Venom: "Don't talk. Fight."
Round 4:
Rengoku and Venom–Tanjiro move together — Flame Breathing + Sun Breathing + Symbiote Blades.
Every strike blazes with light and heat.
Akaza roars as his flesh burns, the symbiote's acidic tendrils tearing through his arms.
Round 5:
The sky brightens — dawn.
Akaza's regeneration falters as sunlight bleeds across the horizon.
He rips free, one arm missing, fleeing into the forest.
> Akaza (retreating): "Next time, monster boy!"
Venom: "You'll regret surviving."
Rengoku kneels, breathing heavily but alive.
Tanjiro helps him up, smiling in relief.
> Rengoku: "You saved me… both of you."
Venom (simply): "Okay."
Rengoku laughs, his flame-bright eyes reflecting the sunrise.
> Rengoku: "Together, we'll protect this world — humans, demons, even… aliens."
Venom actually chuckles.
> Venom: "Strange world. I think I like it."
The morning sun spills across the wreckage of the train.
The Flame Hashira lives.
Akaza limps into the shadows, one arm gone, pride shattered.
Be continued...