Tamayo thought for a moment, then picked up a test tube.
Inside it—
Was a tiny amount of Demon blood.
Barely visible.
"About this much," she said gently.
Xia Feng took the tube and looked at it, clearly considering something.
But before he could act—
Tamayo smiled knowingly. "That's not Muzan Kibutsuji's blood. Even if you drink it, it won't help your experiment. At most, it'll just make your body feel unwell."
Xia Feng paused, then gave an awkward smile and put the tube back.
She saw right through him.
He simply wanted to understand Muzan's limits as quickly as possible.
Tamayo looked at him. "How many people has Muzan turned into Demons by now?"
"Not certain," Xia Feng replied, "but at least two cities."
Tamayo sighed softly. "Then he's already reached his limit. If he continues distributing his blood, even he will suffer severe side effects."
Xia Feng nodded.
That was… good news.
Even though two entire cities had been turned—
At least the number wouldn't keep increasing indefinitely.
The total number of Demons—
Was now capped.
Still terrifying—
But finite.
"How's your research going?" Xia Feng asked.
Tamayo shook her head helplessly. "I need more samples. The Demon blood I've collected so far is far from sufficient."
Xia Feng snapped his fingers. "Then I'll go find some Upper Moons. Maybe I'll get lucky. Besides… Muzan clearly wants me dead. If I move around alone, he'll definitely come after me."
Tamayo frowned slightly. "But that would put your life in danger."
Xia Feng smiled casually. "That doesn't matter. Turning Demons back into humans is more important."
[System Notification: Gained favor from Tamayo. Reward: One Silver Draw.]
Xia Feng's mood instantly improved.
After leaving the lab—
He used the Silver Draw without hesitation.
[System Notification: Drawing… Success!]
[System Notification: Obtained Silver Ability — Jet Pistol!]
[System Notification: Jet Pistol — Compresses air through rapid strikes, firing it like a bullet.]
Xia Feng's eyes lit up.
A ranged attack.
Exactly what he needed.
He left headquarters shortly after.
However—
Finding Upper Moons wouldn't be easy.
After what happened in the Infinity Castle—
Muzan would definitely order them to avoid Xia Feng at all costs.
Even multiple Upper Moons together had failed to kill him.
Alone—
They stood no chance.
So even if Xia Feng left headquarters—
They wouldn't dare approach him.
But not long after—
An urgent message arrived from headquarters.
Upper Moons had appeared at the Butterfly Estate.
Multiple Demon Slayers had already been killed.
The Hashira were rushing there—
But several Upper Moons had appeared simultaneously.
Many Hashira were being held back elsewhere—
Unable to reach the Butterfly Estate in time.
"Those bastards… daring to attack while I'm gone?!"
Xia Feng immediately turned back toward headquarters.
But soon—
He stopped.
At the entrance—
A sea of Demons.
Endless.
Numbering in the tens of thousands.
Like an army of the undead.
"Muzan Kibutsuji…"
Xia Feng's eyes narrowed instantly.
He understood.
This was all part of Muzan's plan.
While Xia Feng was away—
Launch a full assault.
Destroy headquarters in one decisive strike.
Once the Demon Slayer Corps lost its base—
It would collapse entirely.
"He really thought this through…"
Xia Feng drew his Nichirin Blade.
But even he—
Felt the pressure.
There were simply too many.
Killing them one by one—
Would take forever.
His intangibility wouldn't last long enough to carry him all the way through.
He needed to get closer first—
Then use it at the right moment.
The Demons noticed him.
Their faces twisted as they lunged forward in unison.
Xia Feng glanced around sharply.
"These Demons… they're not attacking anyone else."
His eyes narrowed.
"They're being controlled… targeting only me."
Muzan—
Was deliberately using them to block him.
Xia Feng raised his blade.
"Water Breathing, Tenth Form—Constant Flux!"
His movements flowed like water.
His blade carved through neck after neck—
As he weaved through the horde.
Even as Demons reached for him—
He evaded with perfect precision.
With his heightened perception—
It was as if he could predict every movement.
Dozens of heads fell.
Bodies crumbled into ash.
But—
He didn't stop.
"Thunder Breathing—Thunderclap and Flash!"
His speed exploded.
He plunged deeper into the horde—
Carving a bloody path forward.
Still—
Breaking through completely—
Was far from easy.
Breathing.
That was the problem.
No matter how strong he was—
His lungs had limits.
Switching between Water Breathing and Thunder Breathing only increased the strain.
There were stories—
Of Demon Slayers pushing their breathing techniques too far—
Spitting blood—
Their lungs collapsing—
Dying where they stood.
Xia Feng had no intention of becoming one of them.
As he took a breath—
He suddenly threw out several Momotaro Dumplings.
They landed in the mouths of a few stronger Demons.
These were leftovers—
Originally meant for Nezuko.
But now—
They proved useful.
The Demons froze.
Confusion replaced their aggression.
They stopped attacking—
Creating a brief opening.
Xia Feng seized the moment.
Looking at them, he said calmly—
"I need to get inside."
"Clear a path for me."
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