They didn't know that Nakime, Kibutsuji Muzan's attendant who possessed a space-type Blood Demon Art, was initially tasked with assassinating Kagaya Ubuyashiki.
However, a shocking upheaval had occurred within the Infinity Castle, forcing Nakime to return and help Kibutsuji Muzan stabilize the Infinity Castle's space.
In the current stalemate battlefield, if Nakime appeared and successfully assassinated Kagaya Ubuyashiki, it would undoubtedly be a devastating blow to the Demon Slayer Corps' morale.
Fortunately, such a thing did not happen.
Chu Yang, in a subtle way, had once again helped the Demon Slayer Corps avert a crisis.
However, from the overall perspective of the war, the Demon Slayer Corps was still the weaker side, because in addition to the Upper Moons, there were also Lower Moons leading a large number of demons on the battlefield, slaughtering swordsmen with an absolute advantage.
Kagaya Ubuyashiki was burning with anxiety; before the war, he was full of confidence, believing that he would surely win this war concerning the fate of humanity, but ever since Chu Yang had silently disappeared, his confidence had gradually crumbled.
Only then did he remember that the premise of victory had, from the very beginning, rested solely on Chu Yang, just like a certain scene he had witnessed when he foresaw the future.
"Don't guard me here; hurry and stop the Lower Moons," Kagaya Ubuyashiki turned to Sakonji Urokodaki and Jigoro Kuwajima and said, "Now only you can save those swordsmen."
Sakonji Urokodaki hesitated, "If something happens to you..."
Kagaya Ubuyashiki shook his head, "Whether I live or die will not affect the overall situation at all. You should have participated in the battle from the start; it's not too late now, and you can save many people."
Sakonji Urokodaki and Jigoro Kuwajima still hesitated; they knew that their master was intentionally saying this to save those swordsmen.
"Do I really have to commit suicide here before you will act?" Kagaya Ubuyashiki lost his temper with his subordinates for the first time, accidentally biting his lip as he spoke, and blood slowly trickled from the corner of his mouth.
Seeing this, the two no longer hesitated and simultaneously disappeared from Kagaya Ubuyashiki's side, choosing to join the battlefield and jointly confront the six Lower Moons.
Only then was the critical situation alleviated.
"Master, don't worry, I am also a swordsman, and I will definitely protect your safety!" Shinobu Kocho said firmly.
"Me too," Makomo's voice also sounded.
"Thank you," Kagaya Ubuyashiki smiled and nodded, then tightly grasped his wife Amane's hand.
The couple, with a tacit understanding, secretly prayed, hoping for a turning point to arrive sooner, so that those vibrant lives could live a little longer.
Heaven seemed to have heard their prayers, as the entire Demon Slayer Corps camp suddenly trembled violently.
A tear suddenly appeared in the dark night sky, followed by more and more black holes.
Many trees extended from the depths of the darkness, continuously pouring out, seemingly trying to break open the confines of space.
Such a terrifying sight caused both sides to temporarily forget about the battle.
Kokushibo saw a glimpse of the Infinity Castle from a certain spatial rift, and he instantly trembled, saying in surprise, "What is Nakime doing? Why is she making the Infinity Castle descend here? Could it be... Kibutsuji Muzan has already won?!"
Kokushibo's voice instantly spread throughout the entire battlefield, and after a moment of silence, cheers like a mountain cry and a sea roar erupted on the battlefield.
Daki cheered joyfully, not forgetting to mock Tengen Uzui, who had suppressed their siblings to a pulp, "What now? You guys seem to be losing! When Kibutsuji Muzan descends, everyone will die!"
Gyutaro licked the corner of his mouth, looking at Tengen Uzui with a sneer.
Tengen Uzui didn't say much; he just calculated in his mind that no matter the cost, he must eliminate these two siblings in front of him.
Gyokko swayed inside his sturdy pot, mocking Iguro Obanai and Mitsuri Kanroji with almost the same words.
Hantengu, however, did not mock Kanae and the others; instead, he reverted to his timid old man form and said thankfully, "Fortunately, Kibutsuji Muzan is here, otherwise, I might really have died here today."
He was the only demon among the Upper Moons who had the upper hand, yet he spoke in such a tone, which made it even more ironic.
Kokushibo remained silent, his aura emanating a suffocating pressure.
Gyomei Himejima clasped his hands together, having already resolved to perish with Kokushibo; if he could take down this strongest Upper Moon, then the others would naturally have a greater chance of winning when facing Kibutsuji Muzan.
Kyojuro Rengoku also had the same intention.
On the Demon Slayer Corps' side, everyone's faces were pale, and many were in a daze, just a step away from giving up the will to live.
The terrifying sight overhead had gradually calmed down, and the entire space began to stabilize.
Did they really lose?
Kagaya Ubuyashiki stared intently at the cracks in the sky, his pupils bloodshot; the future he saw was not like this!
He didn't believe it, and neither did Kanae.
"He will never lose!"
Finally, those cracks completely disappeared, replaced by a dense growth of trees, which had unknowingly occupied more than half of the battlefield.
One of the largest trees had a trunk that probably required dozens of people to embrace, and at the very top of the tree, a figure became increasingly clear under the moonlight.
He was carrying something resembling a coffin on one shoulder and a human head in one hand.
The head's face was occupied by a massive eyeball, and its eyes were filled with terror.
Daki, who had been so smug just now, recognized the identity of that head, her expression changed, and she shrieked, "Nakime!"
"Oh, you know her? Then she's yours!"
Immediately after, Nakime's head was thrown out.
Daki instinctively reached out to catch it, but the head turned to ash in mid-air.
Kokushibo looked up with a grim expression, but he did not see the familiar figure.
That wasn't Kibutsuji Muzan!
The battle within the Infinity Castle was over.
Nakime was dead.
But the person who came out was not Kibutsuji Muzan.
What this meant, all the demons present knew clearly; they had lost, completely lost. From now on, there might no longer be any demons in the world.
"Hahahahaha!!!"
Kagaya Ubuyashiki slammed the railing he was leaning on, his laughter more unrestrained than ever before; listening closely, one could even hear a hint of a sob.
With this laugh, he vented the Demon Slayer Corps' thousand years of resentment.
Kagaya Ubuyashiki's laughter spread across the battlefield, forming a strong contrast with the arrogant laughter of the Upper Moons from before.
"Don't laugh! Don't laugh! You damned human, you lowly worm!" Daki's emotions completely spiraled out of control, continuously spewing venomous curses. If she could, she would tear that man's mouth apart right now.
But the next moment, Tengen Uzui's nichirin blade drew a brilliant silver light in the darkness, precisely beheading her, and Daki's curses abruptly ceased.
Daki did not die, but she was too terrified to speak.
Unless both siblings were beheaded simultaneously, one of them would revive endlessly. If it weren't for this, Daki would have died hundreds of times under Tengen Uzui's nichirin blade.
Next to collapse emotionally was the naturally timid Hantengu.
His Blood Demon Art went out of control, completely berserk.
The four emotional clones merged directly, and the final composite form descended.
Zohakuten!
The timid demon, as the main body, also underwent a transformation; its size greatly increased, its expression changed from timid to extremely ferocious, its eyes were blood red, and a character for "hatred" was faintly engraved on its tongue!
This was Hantengu's final emotional incarnation—the Hatred Demon, and also his last safeguard.
Out of survival instinct, Hantengu unleashed his full power without reservation.
Sanemi Shinazugawa and Kanae, who were fighting him, suddenly felt immense pressure.
Both Zohakuten and the Hatred Demon could use the Blood Demon Arts of all previous emotional clones; in other words, Sanemi Shinazugawa and Kanae were each fighting the four previous emotional clones simultaneously.
The two of them had to fight four opponents each.
Just as the situation became precarious, Gyomei Himejima, Kyojuro Rengoku, and Tomioka Giyuu simultaneously joined the battlefield.
They no longer needed to confront Kokushibo.
Because the person who handled Kokushibo had returned.
And at this moment, Kokushibo's mind was not on these three people.
Kokushibo, in an extreme rage, stared intently with his six eyes at the tree coffin Chu Yang was carrying on his shoulder.
He had a very strong premonition that Kibutsuji Muzan was inside.
Kokushibo felt that he hadn't lost yet.
As long as he defeated the man carrying the tree coffin and released Kibutsuji Muzan, then victory would still be theirs.
Therefore, Kokushibo charged furiously towards Chu Yang.
It wasn't that Chu Yang had to keep Kibutsuji Muzan alive; it was that he truly couldn't kill this monster with five brains and seven hearts.
Kibutsuji Muzan from hundreds of years ago was different from the current Kibutsuji Muzan; at least his regeneration ability could now greatly resist the effects of Sun Breathing.
No matter how many times Chu Yang tried to kill him in the Infinity Castle, the terrifying high-speed regeneration would allow him to revive at the last moment, which was why Kibutsuji Muzan had stalled Chu Yang for so long.
Chu Yang realized that he seemed unable to deal with this guy.
To completely kill Kibutsuji Muzan, he had to wait until dawn and let the sunlight burn him to death.
To prevent Kibutsuji Muzan from repeating his old trick from hundreds of years ago and escaping right under his nose, Chu Yang could only seal him in a tree coffin.
The effect seemed quite good.
Kokushibo sped up the tree trunk, rushing upwards directly towards Chu Yang.
This was a peculiar fellow; even after becoming a demon, he still fought as a swordsman, and he was the only demon among the Twelve Kizuki who used a Breathing Style to fight.
If Kibutsuji Muzan's monstrous regenerative ability was not taken into account, judging solely by destructive power, Kokushibo was no weaker than Kibutsuji Muzan.
Kokushibo could also fight in his Mark state.
Even a Hashira, encountering Kokushibo, would suffer a fate not too different from encountering Kibutsuji Muzan.
But unfortunately, Kokushibo's opponent this time was Chu Yang; no matter how powerful his destructive force, he could not break through the Armament Haki on Chu Yang's body.
The moment he rushed to the top of the giant tree, the form of Kokushibo's nichirin blade, Cry of False God, changed.
The blade writhed like living flesh, continuously elongating and developing many sharp edges.
As a weapon personally crafted by Kokushibo using his own flesh and bones, the Cry of False God was now in its original form.
Gyomei Himejima and the others only then realized...
It turned out that Kokushibo had still held back some of his strength when fighting the three of them.
Kokushibo, unleashing his full power, exuded a suffocating aura that, even from a distance, sent chills down the spines of everyone present.