Two days after the battle against Doma and Daki, Kagaya summoned all the demon slayers scattered throughout the country, preparing for the final battle. At the same time, as if by a silent agreement, Kibutsuji Muzan also called all demons to the Infinity Castle, ready to attack the demon slayers' headquarters to capture Nezuko, a demon who had overcome her weakness to sunlight.
At the demon slayers' headquarters, the atmosphere in the room was very tense. In the center of the room, Kagaya sat with a serious expression; his condition was very poor, and he could barely stand.
The Hashira gathered around him, each gazing at him with concern and attention.
Kagaya spoke calmly despite the tension enveloping the room. "Right now, the hope of victory lies in our hands. The decisive battle with Kibutsuji Muzan is imminent. I hope you can all give your utmost strength…"
Hearing those words, the Hashira exchanged glances. In their eyes was a determination to sacrifice themselves to eliminate the demons.
Kagaya continued, "I have decided to use myself as bait. When Muzan appears, I will be at a predetermined location, planting explosives and poison around him. This way, we can weaken him before we fight."
The atmosphere in the room grew even tenser. Sanemi was the first to speak. "But, Oyakata-sama! This is suicide! We can't allow you to do this!"
"He's right," added Rengoku Kyoujuro, his face showing worry. "We can find another way. We don't need to sacrifice your life!"
Tears streamed down Gyomei's face as he continued to chant Buddhist prayers.
However, Kagaya remained steadfast in his decision. "I am already on the brink of death. The curse that is gnawing at my body won't give me much time left. If I can use the remnants of my life to weaken Muzan, then that is the path I must choose."
Haru observed everything quietly without speaking, certainly not opposing Kagaya's decision, because with that trap, at least Kibutsuji Muzan's power would weaken. She was not arrogant enough to fight Kibutsuji Muzan while he was at his peak.
The Hashira exchanged glances, filled with uncertainty and pain. But in the end, they could not change Kagaya's decision.
After that, they began planning their strategy. They knew they had to create a clear trail for Muzan to track them. By revealing their presence, they hoped to attract Muzan's attention and force him to appear.
The following days were filled with intense preparations. The Hashira worked together to set traps around Kagaya's residence.
In one night, they successfully built a complex trap.
.....
A few days later.
Kagaya lay in bed in a simple room, Amane faithfully by his side.
"Amane, I'm sorry for involving you," Kagaya said softly to his wife.
"No, it was my own decision to accompany you. Besides, Kibutsuji Muzan would be suspicious if it were just you here," Amane replied gently, without fear of death, looking at Kagaya with love.
"I am very fortunate to have a wife like you, Amane," Kagaya said gratefully.
The night grew late, and the moon hung high in the sky as if bearing witness.
Tap.... Tap.... tap....
The sound of footsteps echoed in the silent room. The footsteps drew closer. Soon, Kibutsuji Muzan appeared before them.
"How pathetic, the leader of the demon slayers who has always obstructed me is a dying cripple," Kibutsuji Muzan commented cynically as he looked at Kagaya.
"Amane, is that Kibutsuji Muzan? What does he look like?" Kagaya asked Amane; he could not see, so he could only ask her how Kibutsuji Muzan appeared.
"He is a man who looks to be in his twenties, with a tall, slim, muscular build, and unnaturally pale skin. He has curly black hair and sharp, almond-shaped eyes. His irises look like a cat's and are plum red. He also has sharp blue claws on his hands," Amane described Kibutsuji Muzan's appearance to them.
"He wears a luxurious three-piece suit, consisting of a white collared shirt, a black tie, a black and gray paisley patterned vest fastened with gold buttons, and a white jacket. He wears formal white trousers, light brown loafers, and completes his outfit with a long black-collared coat," Amane continued.
"So... We meet for the first time, Kibutsuji Muzan. It has been a thousand years, and you still look young," Kagaya greeted softly, as if greeting an old friend, hiding all his hatred for Muzan.
"Do you know, Muzan, the connection between you and the Ubuyashiki clan?" Kagaya asked calmly.
Muzan did not respond and listened patiently to Kagaya's words. He was in no hurry; to him, Kagaya in front of him was already dead, and he could kill him whenever he wanted.
"In the distant past, thousands of years ago, a sickly boy was born into the Ubuyashiki clan. According to the doctors at that time, he would not live to see twenty-five. But miraculously, he managed to crawl back from death. After a mysterious doctor healed his illness and gave him a strong, eternal body, he became a demon. Because this family produced the first demon, this family was cursed, and every male child born into the Ubuyashiki family would be born with a disease that would kill them before they fully matured. This disease caused a skin condition resembling burns that would eventually cover their entire bodies and shorten their lifespans."
Wanting to be freed from this curse, the members of the Ubuyashiki family at that time approached a priest, who told them that the male heir must marry a woman chosen by the priest. Because of this, the male children of Ubuyashiki managed to survive into adulthood, although still plagued by illness and dying in early adulthood. The priest also told this family to make killing you the purpose of their family's existence, as the curse would remain until this family eradicated evil and cleansed the stain in their lineage, which is you, Kibutsuji Muzan!!!" At the end of his words, Kagaya could not hide his hatred.
"Is that all you want to say? If so, then die," Muzan asked, not caring at all about Kagaya's words.
..... Boommmmm.....
As Muzan was about to attack, the room suddenly exploded, with various fragments and small weapons made from scarlet crimson iron sand and scarlet ore. In addition, there were hundreds of wisteria poisons and aging poisons, attacking Muzan and piercing him like a sieve.
In the midst of the blazing fire, the figures of Kagaya and Amane could no longer be seen; their bodies were obliterated in the explosion.
"Kagaya Ubuyashiki!!!!!!!... You're insane!!!! You even brought your wife to commit suicide!!! Just to kill me?!!!" Kibutsuji Muzan screamed in hatred as he felt his power weakening and several strange substances continuously working against him.
"Kibutsuji Muzan, die!" Before Kibutsuji Muzan could process the various poisons in his body, Tamayo, who had been hiding behind the illusion barrier created by her blood demon art, leaped out and stabbed Muzan with her right hand.
"Oh? You're the demon who escaped my control a few hundred years ago," Kibutsuji Muzan said as he recognized Tamayo.
He cut off Tamayo's hand and absorbed it into his body.
"Oh, Kibutsuji Muzan, you dare to absorb my hand? I have injected that hand with a human-altering potion," Tamayo said sarcastically.
"You... How dare you, ungrateful wretch. When you were nearly dead, you begged me to turn you so you could be with your child," Muzan shouted in furious anger as he felt his body growing weaker and his regenerative abilities suppressed to their lowest level. It would take him a long time to break down the various potions and poisons in his body. His body soon expanded into a gigantic mass of flesh covered with thorny whips.
"Kibutsuji Muzan!!! You deceived me!" Tamayo screamed with hatred and near madness as she recalled Muzan's words, making her remember the horrific events, causing her stomach to churn at the thought of how Muzan had tricked her, turning her into a demon and killing her children before devouring them due to her demonic hunger.