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... Rui was the demon he valued most among the Lower Moons because his experience was very similar to his own, and his aptitude was also good.
With proper nurturing, he had a high chance of advancing to an Upper Moon in the future.
Fearing that demons gathering together might threaten his rule in the future, he ordered all demons not to associate and to only act alone.
Only Rui was an exception; he was allowed to gather other demons on Mt. Natagumo and play house.
But what he didn't expect was that Rui, Lower Moon Five, was actually killed, and the key was that he didn't die at the hands of a Pillar.
Instead, he died at the hands of a strange human boy.
This boy neither used poison nor a nichirin blade, but rather used a move very similar to a Blood Demon Art, instantly killing Rui with one strike.
Although he hadn't experienced it himself, he felt that if he took a hit, he would likely be in danger as well.
What was more troublesome was that if the Demon Slayer Corps mastered a method similar to a Blood Demon Art, their strength would inevitably increase greatly.
"Nakime, gather all the Lower Moons and Upper Moons at the Infinity Castle!"
Kibutsuji Muzan turned his head to look at a one-eyed female demon behind him who was playing the biwa for him.
Although the one-eyed female demon was not one of the Twelve Kizuki, she possessed the strength of an Upper Moon-level demon and was a demon he valued.
Her Blood Demon Art involved spatial abilities, allowing her to instantly bring the Twelve Kizuki into his stronghold, the Infinity Castle.
The boy who killed Rui made him feel uneasy; he had to find out information about the boy.
But he couldn't possibly handle such a matter himself, because he was afraid of death.
That's right, as the strongest demon in the World, what he feared most was death.
Even though his strength could easily kill any Pillar of the Demon Slayer Corps, or even destroy the entire Demon Slayer Corps, he never dared to act personally.
He merely kept sending the demons he transformed to fight against the Demon Slayer Corps.
Because back then, he encountered a Demon Slayer Corps swordsman named Yoriichi Tsugikuni, and he thought he could easily kill him.
As a result, he was almost cut down by him, just by that tiny bit, and even now, recalling it still fills him with lingering fear.
Yoriichi Tsugikuni had died long ago, but the sword wounds Yoriichi Tsugikuni left on him still gave him psychological Shadow to this day.
So without absolute certainty, he would never personally deal with the Demon Slayer Corps swordsmen.
Just in case he encountered another Yoriichi Tsugikuni.
On the other side, Little Goku followed Sanda and all members of the Demon Slayer Corps to the Demon Slayer Corps Headquarters.
The Demon Slayer Corps Headquarters was located in a mountain range far from the city, and Little Goku, who was not a member of the Demon Slayer Corps, was asked to wear a blindfold on the way.
Little Goku didn't mind this.
Sanda told him that this was a necessary measure to prevent the headquarters' location from being leaked.
If Little Goku was willing to join the Demon Slayer Corps later, he would be able to freely enter and exit the headquarters.
The scale of the Demon Slayer Corps Headquarters was not small, almost comparable to a typical human town, with many wooden buildings.
Little Goku was arranged in a separate room for the night.
As for dinner, because Sanda knew Little Goku's appetite, he didn't go hungry.
The next day, Little Goku woke up from the White space, entered the World of "Demon Slayer: Kimetsu no Yaiba," and appeared in his room at the Demon Slayer Corps Headquarters.
Pushing open the door, he happened to see Tanjiro carrying a box, as well as the blonde boy and the boar-headed man.
The blonde boy was named Zenitsu Agatsuma, and the boar-headed man was named Inosuke Hashibira.
"Good morning!"
Little Goku enthusiastically raised his hand to greet them.
"Hahaha, Little Goku, let's duel! If I defeat you, I'll be the strongest!"
Seeing Little Goku appear, the boar-headed man immediately rushed towards Little Goku excitedly, like a charging wild boar.
"Boar Rush!"
Because of Little Goku's appearance yesterday, none of the three were seriously injured, and Little Goku even helped treat them on the way.
So today when they woke up, their injuries had completely recovered.
However, because their nichirin blades were broken by the Father Demon, they currently had no blades.
So when the boar-headed man rushed towards Little Goku, he was empty-handed.
"A duel, I love it!"
Having someone challenge him to a duel so early in the morning, Little Goku was in a very good mood.
With a light leap, he dodged the boar-headed man's Boar Rush, and Little Goku followed with a whip kick, causing the boar-headed man to fall unconscious.
"Inosuke!!!"
At this moment, the Scarface Boy and the blonde boy reacted, rushing over and bowing repeatedly to Little Goku, apologizing.
At the same time, they were once again shocked by Little Goku's strength; Inosuke was taken down in one move.
As expected of the boy who could kill Lower Moon Five and defeat the Insect Pillar.
"No need to apologize, I love dueling people. It's just that he's a bit too weak; he still needs to train hard."
Little Goku waved his hand, not minding at all.
"Little Goku!"
Just then, a familiar voice rang out; it was Sanda walking over.
"Good morning, Uncle Sanda."
Little Goku raised his hand to greet him.
"Good morning."
Sanda responded with a smile:
"Little Goku, My Lord wants to see you; he has something to talk to you about."
Last night, after arranging Little Goku's food and lodging, he had left the headquarters and been summoned privately by My Lord once.
My Lord was not always at the headquarters, only appearing occasionally, and many orders were conveyed by crows.
Even though he had been in the Demon Slayer Corps for so many years, it was his first time being summoned privately by My Lord.
My Lord summoned him mainly to understand the entire process of how he met Little Goku and all related information.
Actually, he could understand; Little Goku possessed the strength to defeat a Pillar, and also had various abilities.
No matter how much My Lord valued him, it wouldn't be excessive.
This time, My Lord meeting with Little Goku was probably to personally invite Little Goku to join the Demon Slayer Corps.
"Alright!"
Little Goku nodded, not refusing.
Uncle Sanda had said that My Lord was the leader of the Demon Slayer Corps, and if he wanted to join the Demon Slayer Corps to learn breathing techniques, he had to get My Lord's permission.
"You come too. Later, you must honestly explain the situation, only then might you have a chance to save your life and your sister's."
Seeing Little Goku agree, he turned his head and looked at Tanjiro, who was carrying a box, with some pity.
Little Goku was going to see My Lord because he was invited to join the Demon Slayer Corps.
Tanjiro, on the other hand, was going to face a joint trial by My Lord and the Nine Pillars.
If things went badly, Tanjiro and his demon sister Nezuko might be cut down on the spot by the Pillars.
Some of the Pillars didn't have very good tempers.
"I understand!"
Tanjiro took a deep breath and said to the blonde boy next to him:
"Zenitsu, you take Inosuke to rest. I'll be back after I see My Lord."
"Tanjiro..."
The blonde boy looked worried, but under the Scarface Boy's comfort, he still nodded and dragged the boar-headed boy away.
So, led by Sanda, Little Goku and Tanjiro, who was carrying a box, arrived in the courtyard of the largest house in the center of the headquarters.
And at this time, people were already waiting in the courtyard.
However, it wasn't the Demon Slayer Corps' My Lord, but the nine strongest Pillars of the Demon Slayer Corps.
Seven of them stood in the center of the courtyard, each with an extraordinary aura.
There were also two others, one standing in a corner, who was the taciturn Water Pillar, Giyu Tomioka.
The other was half-lying on a tree trunk in the courtyard, a yellow-eyed young man, the Serpent Pillar, entwined by a White snake...