Countdown to Blowing Up Muzan for Coins X: On the Theory of Causality

Pain... an excruciating pain... it felt like his heart was being ripped out with a knife, the pain Muzan Kibutsuji knelt on the ground, "Listen..."

"Bah..." He kept inhaling...

He groaned in pain, then slumped to the side, curling up into a bow-like shape...

Nakime stopped playing. Beside her, Kokushibo was practicing his swordsmanship, honing his skills day after day. Suddenly, he sheathed his sword, "Kyokotsu," obscuring the Moonlight. With a start, a tiny crescent blade appeared, flashing out and instantly slicing through a corner of the floor...

"Crack~" The wooden floorboards slumped into the void, only to spring back to their original state as Nakime koto... This disheveled female ghost, whose true face remained hidden, felt the demon blood belonging to Muzan Kibutsuji surging and vibrating within her, and softly called out, "Muzan."

At the headquarters of the Eternal Paradise Faith Cult, the demon boy dressed as the cult leader, enjoying himself behind a curtain, along with the Entertainment District Gyutaro and his sister Daki, and countless other Demon transformed by Muzan or Upper Rank, all simultaneously ceased their actions, whether devouring blood or seeking refuge from the sunlight, as if rehearsed beforehand...

Touching his chest, the spot where his heart lay—the very place where Muzan's blood resided—he was shocked to discover... an emotion called "fear" and "panic" suddenly surfaced, then swelled, grew wildly, and in an instant transformed into a tidal wave that engulfed him...

Everything seemed to point to Muzan Kibutsuji, and in a daze, the demons realized... "That lord is afraid!"

"My lord." His heart pounded with emotion, but Kokushibo, through sheer willpower, forcefully suppressed it...

The man, with the inscription "The Kyokotsu" hanging from his waist, dressed in a kimono with purple snakeskin and black spots, and black riding hakama under his lower body, moved his wooden clogs and instantly appeared beside Muzan Kibutsuji. He reached out and helped him up, and then glanced at him... The once indifferent, life-and-death, demon-ruler who controlled all demons was now unusually pale and disheveled, clinging tightly to him...

Most of his body was hanging on him, and he said with a ferocious expression, "It's Kamado Eiichiro!"

Muzan groaned in Muzan, "He must have done something... Michikatsu, I can feel it, he's trying to harm me behind my back!"

A head of fiery red hair swayed in the wind... Kokushibo's six eyes suddenly narrowed, as he suddenly recalled that day when he and the Sun-Earring Boy, through the Eye Demon and the battle on the Mugen Train, exchanged a glance across space... "Clang~" The sword was drawn, flashing with cold light.

Kokushibo stepped forward, firmly shielding Muzan behind him, and said, looking ahead, "My Master, do not worry. Just ask him what happened!"

[Transcendence Realm]... Open!

Wow!

Perception transcends physiological limits, and Divine Power touches the philosophical realm... This Divine Power, which integrates the life insights of Kokushibo, or Tsugikuni Michikatsu, allows him to see clearly through "eyesight"!

Amidst the empty wooden floor, a wisp of mist appeared out of nowhere... The mist outlined the figure of Sun-Earring Boy, whose eyes "poof" ignited "two suns"—it was... using the [Curse] to follow the [Thread of Causality] and with the Ubuyashiki Kagaya as a carrier, a wisp of consciousness was separated, outlining a conscious body, and rushing into the Infinity Castle —Roy's consciousness Clone!

"Kamado Eiichiro Muzan, relying on physical contact with Kokushibo and Share [Transparent World], upon spotting Roy's figure, nearly shattered his teeth, and the veins on his forehead bulged like writhing dragons, each one ferociously spitting out a " Spine Whip "!

[Spine Whip]: Spine Whip that extends from both arms, combining offense and defense, flexible and unstoppable, as solid as a rock.

Its attack range is extremely wide, covering a radius of ten meters, and the spikes on the whip can Muzan changed in position and shape at Muzan's will. Its swing speed is incredibly fast; in the original work, even Himejima Gyomei, who had awakened the Transparent World, couldn't react. At its peak, its speed even sent chills down Yoriichi Tsugikuni's spine. It possesses immense destructive power; a direct hit can destroy half a house. Furthermore, the Spine Whip carries Muzan's blood; according to Muzan's will, the cells within it do not turn the target into a demon, but rather destroy all of the opponent's cells, requiring only a single strike to kill.

What's most despairing is that the Spine Whip is also covered with countless "mouths" that can generate tremendous suction as they open and close. They can even create Uzumaki Clan in the air, slowing down the opponent's movements, tearing apart everything around them, and greatly compressing the opponent's space to use their sword skills!

"Whoosh—" The Spine Whip, carrying Muzan's Muzan tiny, open mouths sucked at Roy... Below, a sword light, even faster than the Spine Whip, flashed with a cold light, instantly unleashing hundreds of crescent blades. Breaking through spatial limitations, it combined with the Spine Whip to create Uzumaki Clan that controlled Roy's body, slashing towards Roy...

The Sun-Earring Boy, with his fiery red hair whipped backward by the wind and lashes of blades and whips, seemed to be pondering his current state.

[Nature][Backlash][Cause and Effect][Reincarnation]... Cause and Effect... There is no effect without a cause...

"Pfft~" As the Curse within Kagaya Ubuyashiki was extinguished by several "Solar Flame Sword," Roy's consciousness drifted away, unintentionally embarking on a fleeting journey along the causal path. Looking back, he vaguely understood something, yet it wasn't entirely clear. With this hazy feeling, he opened his hands, materializing Asauchi- [Eclipse], and whispered, "Release."

"All things return to ashes. The Sunrise in the East."

Suddenly... a crimson sun leaped from the tip of Roy's knife, slowly rising as the Sun-Earring Boy lightly challenged the Eclipse.

That "Spine Whip"... that "moon blade"... it was like a mouse fleeing in panic, unfortunately encountering a tabby cat that had been waiting around the corner for a long time, instantly melting, collapsing... annihilating into nothingness!

"Sun Breathing?"

"This is not Yoriichi's swordsmanship!"

"This technique isn't in the Sun Breathing!"

"Whoosh~" The face burst into flames the moment it was exposed to the blazing sun...

Muzan Kibutsuji roared, "Nakime!"

A zither melody rang out.

World shifted!

Roy's figure flickered, retreating on his own, instantly creating distance between himself and Muzan, as well as Kokushibo who was protecting him behind him.

The Sun-Earring Boy watched the other person leave, the wooden planks beneath his feet being replaced one after another. Following [cause and effect], he keenly sensed a hint of [space].

On the panel, the section for [Circle] and the section for [Nen Ability Nature: [Yin Release]] were both eager to be explored.

[Hint: Two "Demon" and one "Demon King" have been detected. The [Monster Compendium] has been expanded...]

[Name: Muzan Kibutsuji]

[Demon King]

[Physical Fitness: 841 (Note: Average person's score is 1)]

[Innate Blood Demon Art: 1, "Grace": Muzan Kibutsuji can forcibly transform others into Demon by injecting them with demon blood, greatly enhancing their physical constitution.]

[Part Two, "Domination": Muzan Kibutsuji has "Absolute Domination" over his Demon. With a single thought, he can Browse their memories, even delete, modify, or restrict them... and take their lives.]

[3. "Multiple Organs": Kibu Muzan cultivate "multiple organs" within his body as his strength increases. He will not die unless all the "organs" are destroyed.]

[Part 4: "Self-Division": Muzan Kibu can split his body into countless small pieces through "self- Muzan" and hide them. As long as even one small piece is not destroyed, he can revive.]

[5: "Whip Techniques": Muzan Kibutsuji skilled in "Whip Techniques," and can use his will to transform a part of his body into a "Spine Whip" or "Tube Whip" to whip others.]

[Six: "Infant Proliferation": Muzan Kibutsuji can Infinite proliferate his body and tissues by transforming into his most original infant state (Note: Muzan Kibutsuji weak in this state and will not activate this unless he is in dire straits)]

[Seven... eight... nine...]

A notification sound... a message... is also a talent.

Roy was dragged backward by Nakime's Biwa, which played a zither-like melody. He watched Muzan Kokushibo flew away into the distance. He casually glanced at Nakime's and Kokushibo's stats: one possessed a large amount of "space" experience, making her extremely well-suited to the [Swamp Space]... the other had countless "Sword Path techniques," which could further enhance his Swordsmanship level if he absorbed them...

As the product spread, all the [Curse] black energy within Ubuyashiki Kagaya's body was cleansed one by one by the "Solar Flame Sword"... With a gentle sway, it gradually faded until it completely disappeared...

As consciousness returned, the person opened their eyes, let out a long sigh, and said to the Ubuyashiki Kagaya, "I have fulfilled my mission; the [Curse] has been removed."

A "crack" sound, like the breaking of shackles, suddenly rang out from within Ubuyashiki Kagaya's body...

The man swayed slightly, his hunched back slowly straightening, a faint blush appearing on his pale face. He exhaled a breath of stale air, feeling an indescribable sense of liberation throughout his body, truly embodying the saying... "One move breaks the shackles, and suddenly the world feels vast..."

Unable to control himself, he let out a soft, comfortable moan. The Transformation was swift, the effect remarkable, and the results immediate!

The kneeling pillars were deeply moved, especially those with the deepest bonds to Ubuyashiki Kagaya, such as Himejima Gyomei, Shinazugawa Sanemi, and Uzui Tengen... who were overcome with emotion, tears streaming down their faces, unable to speak.

"I feel better."

"Eiichiro... My Master... Anada (husband)..."

Excited whispers echoed through the secluded Wisteria Forest.

Following the unveiling of the [Monster Compendium], the "Believer Panel" for "Himejima Gyomei," "Giyu Tomioka Shinazugawa Sanemi," "Tokito Muichiro," and even his senior brother "Giyu Tomioka" were revealed, displaying a message to the Sun-Earring Boy indicating "Loyalty +10 +10 +15..."

The conditions for "Officialization" have been met. All that's needed is to "award them a medal," and everyone can immediately join their ranks.

Roy's hand suddenly felt warm as his right hand was grabbed by both of Ubuyashiki Kagaya's hands, the grip tightening. "Eiichiro... sir, I..."

Excitement, even to the point of incoherence, is the Ubuyashiki Kagaya. It's something the usually composed Kagaya never imagined he would one day appear so flustered.

I want to say something, but I don't know what to say... The Sun-Earring Boy before me has done me a great favor by lifting the curse, it's like giving me a second life!

Roy quietly savored everything around him. His understanding of cause and effect and the concept of "circle" was hazy. He seemed to have grasped some of it, but he still couldn't fully understand it. It felt like there was a thin layer of paper separating them, and he just couldn't break through it.

The Sun-Earring Boy patted Ubuyashiki Kagaya's clenched fists and smiled at him, saying, "I know what you mean. You don't need to say anything. Now you just need to rest and make up for the losses of the past few years as soon as possible."

"Amitabha... Lord Eiichiro is absolutely right." Himejima Gyomei clasped his hands together, looked up gratefully at Roy, then stood up, helped Ubuyashiki Kagaya lie down, and made way for Hinaki, Nichika, and the others —Kiriya, Kanata, and Kuina —who had been led there by Amane...

As Roy used his palm to "dispel darkness" through the sun, he condensed the "Solar Flame Sword" to extinguish the black aura of the Curse that lingered in the hearts of the group... Hinaki, Nichika, Kiriya, who were almost identical to the younger Ubuyashiki Kagaya, suddenly felt a jolt in their bodies, followed by an indescribable sense of ease, and their spirits seemed to come alive!

"Why aren't you thanking Lord Eiichiro!" came a sharp rebuke from Amane.

Hinaki, Nichika, Kiriya all bowed deeply in worship... Not far away, a futon was laid out on the tatami mat, Ubuyashiki Kagaya lay flat on it, silently watching. Suddenly, tears welled up in his blind eyes for the first time, as if his tear ducts had been revived, no longer restrained by the Curse, and began to produce tears. Two streams of hot tears flowed down his face, a sight that moved everyone present...

"Get up, all of you, there's no need..."

"No, Lord Eiichiro, you must endure it!" Ubuyashiki Kagaya seemed to have finally regained his ability to organize his thoughts, and insisted.

None of the pillars who knelt around Roy with him seemed to have any objections... Roy remained silent and had no choice but to accept the bows. A moment later, Hinaki, Nichika, Kiriya were led back to the inner courtyard to rest by Amane. In the vast front hall and wide wooden corridor, Ubuyashiki Kagaya and the nine pillars remained in the blink of an eye, along with Roy, who was narrating the story.

Ubuyashiki Kagaya struggled to his feet, rested for a while, and Himejima Gyomei's help, he found a cushion to support his back and looked earnestly at Roy, saying, "Lord Eiichiro, are you sure you don't want to reconsider?"

"No need, I don't have the energy to deal with such trivial matters of overall planning." Roy waved his hand.

Still preoccupied with [cause and effect] and [circle], just then... Ubuyashiki Kagaya glanced over, and Himejima Gyomei, Shinazugawa Sanemi, and the others exchanged a glance, placed their right hands on their chests, knelt on one knee, and greeted Roy, saying, "Himejima Gyomei / Shinazugawa Sanemi / Uzui Tengen... greets the Master."

Ubuyashiki Kagaya added with a smile, "Then let's Master two Master, both of them."

Roy: "6"

The man said, "I manage my Demon Slayer Corps, and you manage your Believer. Nobody said one can't serve two masters, right?"

Behind Roy, Rengoku Kyojuro, his straightforward nature flaring, exclaimed with gleam in his eyes, "I agree!"

He then patted his chest and shouted, "Praise the sun!"

Himejima Gyomei Shinazugawa Sanemi immediately echoed, "Praise the sun!"

Roy stood alone, like a crane among chickens, looking around silently. He picked up Giyu Tomioka and said, "Senior brother, you..."

"Each to their own opinion," Giyu Tomioka knelt on one knee, raised his head, and, still with that taciturn and aloof demeanor, said calmly, "Call me 'Senior Brother' or ' Giyu ' as you like, but I only acknowledge you as 'Master'."

Roy:"