Chapter 329: The Mugen Train
"How do you feel, Nezuko?"
Tanjiro watched his sister nervously.
Even though Uncle Nine was a renowned exorcist, highly experienced and unlikely to make mistakes, this was a different world after all. Small differences could matter.
"Pfft…"
Mini Nezuko suddenly flopped onto her back, arms and legs sprawled out on the ground.
A puff of thick black smoke shot from her mouth.
It looked like she'd swallowed a lit firecracker.
Tanjiro's eyes nearly popped from their sockets as he frantically shook her.
"Wait, Tanjiro—"
Urokodaki caught sight of something and stopped the panicking boy.
Then,
Nezuko's mini form slowly began to return to normal. She took on her human form again, black smoke seeping from her pores like dark mist.
Putrid. Foul.
"This… is demon blood?"
Tanjiro sniffed, and the stench brought back harrowing memories—
the night his entire family was slaughtered by the Demon King.
That faint trace on Nezuko back then…
It was Muzan Kibutsuji's blood!
Now, under the effects of Uncle Nine's [Five Yang Scarlet Pill],
a gentle yet blazing energy akin to sunlight was purging that evil from her.
"It's working!"
Tanjiro trembled with joy, clamping a hand over his mouth so he wouldn't disturb her transformation.
As the demon blood was purged,
Nezuko's fangs began to shrink.
Her demonic eyes gradually reverted to those of a normal human.
No one knew how much time passed.
Eventually,
Nezuko rose, dazed, and wandered toward the edge of the house.
"Nezuko!"
Tanjiro suddenly shouted—
But Nezuko had already stepped into the sunlight.
"Bro… Brother… I…"
Her mind still foggy, she tried to speak as she looked at the familiar figure before her.
Tanjiro rushed forward and scooped her up into a tight hug, tears streaming freely from his eyes.
"Nezuko… Nezuko… Nezuko… Thank goodness…!"
For the first time in forever,
Tanjiro let out the kind of sobs only a child could—heart-wrenching and raw.
His father had died early,
and he had shouldered the burden of the entire family, selling charcoal just to keep them alive.
No matter how hard life got, he never complained.
Then the Demon King came, murdering them all, even turning his beloved sister into a man-eating demon.
And still, he gritted his teeth and endured.
He trained to wield a blade capable of killing demons,
all to protect Nezuko.
Now, finally,
Tanjiro wept without shame.
Because Nezuko had been reborn.
"She's been a demon for so long. Her memories may be fuzzy, but they should return gradually."
Urokodaki let the siblings have their moment.
Later, he checked Nezuko's condition.
What he discovered made him exclaim in shock.
Tanjiro's heart jumped. "Is something wrong, sensei?"
Urokodaki's expression was serious as he studied Nezuko, then said:
"Nezuko is human again—but her physical abilities are still terrifying, nearly as strong as when she was a demon."
Even with her humanity restored,
Nezuko retained her demon-level strength.
And she no longer feared the sun.
Tanjiro was stunned. "That's even possible?"
Then he remembered Uncle Nine's theory:
Muzan had become the Demon King using Yin-elemental drugs, reshaping his body through a kind of failed evolution.
If done correctly,
he would've become something akin to a Yin god—like the night-wandering spirits and underworld generals in Uncle Nine's world.
Instead, he failed,
and became a monster.
His demon progeny were failed evolutions like him.
But the [Five Yang Scarlet Pill]—
by flooding Nezuko's body with Yang energy—
corrected that failure and guided her toward a complete, successful transformation.
It was like a faint echo of the [Blue Spider Lily] Muzan had so desperately searched for.
The pill had a similar, if lesser, effect.
Now,
Nezuko was no longer a demon.
She was a new kind of human.
Not even Uncle Nine had foreseen this.
"Looks like the will of the Demon Slayer World is making good use of its momentum."
In the Reincarnation Space, Fang Yi smiled as he observed Nezuko's transformation.
"Normally, correcting a flawed evolution like Muzan's would be nearly impossible."
Successful evolution was like winning the lottery—
a rare combination of soul resonance and genetic perfection.
You'd need to feed the pill to millions of demons just to get one Nezuko.
But instead,
the world's consciousness had used its own source energy
to elevate Nezuko—
to make her a template for proper transformation.
Now, thanks to Tanjiro's pill and the world's intervention,
Nezuko had become the blueprint for a "new humanity."
From now on,
that pill—brought back from a mission world—would carry properties similar to the mythical [Blue Spider Lily].
It could purify the blood Muzan left behind.
"It's fine," Fang Yi murmured.
"If the Demon Slayer World wants to erase Muzan using the Reincarnation Game, I'll play along.
These new humans are top-tier players in the making. It's a win-win."
The news that a demon had turned human again
swept across the Demon Slayer Corps like wildfire.
Soon, it was shared across the entire world.
Urokodaki verified it personally.
Then Kagaya Ubuyashiki himself summoned Tanjiro,
confirmed the truth,
and made an official announcement.
For a thousand years,
humanity had suffered under Muzan's reign.
Now they had a cure.
"Is that so…"
Kagaya smiled joyfully. His body, once weak, had recovered thanks to the game.
Now a player himself, he was stronger than any current Hashira.
He could even face Upper Moons alone.
With his [Demon Hunter's Weapon] in hand, he was a demon's worst nightmare.
"I don't care how many reward points it takes. I'll give them all away."
He declared,
"If it means turning demons back into people, then any sacrifice is worth it."
There was no hesitation in him.
The miracle pill, born in the mission world of [Uncle Nine's Mortuary],
would be bought and distributed far and wide.
"Until now, we could only slay demons.
But now…"
Kagaya stood tall, eyes bright.
"We will destroy the wicked and save the innocent.
Muzan's shadow will be erased in our era!"
Tanjiro was promoted on the spot.
No need for a final trial.
His first assignment—
was to board the Mugen Train with the Flame Hashira and investigate a demon rumored to be the infamous [Ripper].
At that very moment—
while the Demon Slayer World's battle reached new heights—
the first responses to the [Multiverse Invitation Letter] arrived.
Three new figures
materialized in the Reincarnation Space,
on the endless snowy peaks of the [Eternal Snow Mountains].
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