Under the command of Kagaya Ubuyashiki, the master of the Demon Slayer Corps.
Parts of the truth about the Infinite Train incident quickly reached the respective Pillars.
"That's great! Mr. Rengoku and Tanjiro are all safe and sound, that's truly wonderful!"
Love Pillar Mitsuri Kanroji let out a sigh of relief, ate twenty sakura mochi in one go, and then set off.
"Upper Moon Three! Finally taken care of? How splendid, Rengoku!"
Sound Pillar Tengen Uzui raised an eyebrow.
"Heh, taking down an Upper Moon, well done, truly worthy of Rengoku!"
Serpent Pillar Obanai Iguro said.
"The next one to take down an Upper Moon will definitely be me!"
Wind Pillar Sanemi Shinazugawa said decisively.
"Taking down an Upper Moon is certainly something to celebrate, but to convene a Pillar Meeting again so soon after the last one, there must be something even more important!"
The strongest member of the Demon Slayer Corps, Stone Pillar Gyomei Himejima, speculated.
Mist Pillar Muichiro Tokito: "..."
Water Pillar Giyu Tomioka: 20 "..."
Butterfly Mansion.
"Although it's rude to say this about Mr. Rengoku and the others, but... to fight an Upper Moon and all emerge unscathed, it's truly incredible!"
Insect Pillar Shinobu Kocho said in surprise.
"Something good must have happened!"
Kanzaki Aoi said.
"I hope so!"
Shinobu Kocho nodded.
"Aoi, while Kanao and I are at the Master's mansion, the Butterfly Mansion is in your hands!"
"Yes, Lady Shinobu~"
...
...
Late night.
Tokyo, Asakusa.
In the study of a luxurious mansion.
A young boy in overalls impatiently flipped through a book.
His tender face bore a ferocious expression unsuited for his age.
On the surface, he was the adopted son of a wealthy family.
Behind the scenes, he was the King of Demons!!!
The source and creator of all demons.
The original ancestor of demons, Demon King Kibutsuji Muzan!!!
At this moment, the reason for his unease was naturally the elimination of Upper Moon Three Akaza earlier that morning.
As his third-in-command, Akaza's strength was incomparable to that of ordinary demons.
Of this, Demon King Muzan was convinced.
Even if the Demon Slayer Corps' Pillars teamed up, they should not have been able to harm Akaza.
However...
Akaza, whom he had dispatched to the Infinite Train that morning to eliminate the Hanafuda earring boy, had failed.
Not only did he fail the mission, but he himself had died there.
When he realized something was wrong, Muzan immediately used his ability as the Demon Ancestor to share senses with Akaza.
The last thing he saw was Akaza being trampled underfoot by a small human girl, motionless, just waiting for the sun to rise.
Who exactly was that small human girl?
What exactly happened during the Infinite Train incident?
Muzan still knew nothing of all this.
His intuition told him that if he didn't take it seriously, something bad would inevitably happen later.
Just as Muzan was contemplating his next move.
Suddenly.
A certain string in his mind was abruptly triggered.
As the King of Demons, he had a direct connection with all the demons he had created.
However...
Now, there was a demon that had escaped his perception and control.
No!
It wasn't just a matter of escaping control.
An inexplicable intuition told him that the demon seemed to be... evolving!!!
Evolving into the ultimate being he had yearned for for a thousand years!!!
"Who is it? Where is it? Did he find the Blue Spider Lily?"
Thinking of this possibility, a sickly flush appeared on Muzan's pale face.
Compared to evolving into the ultimate being, the Infinite Train incident was no longer important.
...
...
Early morning.
The morning sun rose.
Bright sunlight illuminated the earth.
The mist lingering over the lake gradually dissipated.
"The cleanup of the Infinite Train is largely complete. Let's set off for the Master's mansion today!"
Kyojuro Rengoku said.
"Mm! It's truly wonderful that Luo Lin-sama agreed to come along!"
Butterfly Kanae nodded slightly.
"Also... I wonder how Nezuko-chan is doing now?"
"She'll definitely be fine!"
Kyojuro Rengoku nodded firmly.
Just then.
"Woah woah woah!"
Tanjiro, Inosuke, and Zenitsu Agatsuma, who had rushed to the lakeside ahead of them, suddenly exclaimed and shouted repeatedly.
"What's wrong?"
Butterfly Kanae and Kyojuro Rengoku quickly went forward.
"Look, look, look... look over there..."
"The deck... what's that on the deck...?"
Zenitsu Agatsuma and Inosuke stumbled over their words, their eyes simultaneously widening to their limits.
"Nezuko! It's Nezuko! Nezuko is laughing in the sun!"
Tanjiro was immediately moved to tears.
...