Giyu Tomioka, the Water Hashira of the Demon Slayer Corps was travelling through the snowy mountains of Western Tokyo, when a sudden massive explosion rose up in the distance. His old Crow, Kanzaburo flew overhead, "Demon! Demon!" he screeched. "Very well. I'm going" Giyu said, leaping off the tree he was standing on.
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As he rushed through the snow, he came upon a Demon, 'there. It's the Demon. I have to kill it quickly before it gets away!' Giyu thought. He inhaled the frigid air deeply, 'Water-Breathing, Forth Form: Striking Tide' the Hashira sliced the Demon's arms into pieces, as the people he had been piercing with them collapsed to the ground. The Demon glanced back at Giyu, 'a Demon Slayer. And a Hashira at that' he thought.
Giyu turned to the one boy, who, now that he focused on the other's, was the only human there, "what is going on? Tell me quickly!" he ordered. "I have no idea what's going on! But that man- that Demon attacked my family, and- I-I think he changed them somehow!" the boy cried. Giyu grit his teeth, 'he can turn humans into Demons, and with that aura, there's no doubt. This Demon is Muzan Kibutsuji!' he thought. Suddenly a flesh appendage shot towards him, and Giyu barely managed to dodge the attack.
'I can tell. A single scratch will be fatal, I have to end this battle as fast as possible!' he thought, slicing towards Muzan's neck. However the blade slid through the flesh without leaving a wound at all. 'Damn. He heals so fast. I can't behead him!' As more appendages came his way, Giyu flipped out of the way of them, 'Water-Breathing, Sixth Form: Whirlpool!' he thought, as he sliced apart the flesh tentacles. However he got scratched by one of them. 'Guh. So fast!' he let off a barrage of attacks, as Muzan blocked and deflected them easily.
'Water-Breathing, Second Form: Water Wheel'. "For a human, you are agile at least" Muzan complimented. 'Water-Breathing, Tenth Form: Constant Flux!' the Water Hashira sucked in a deep breath and attacked with the last official form of Water-Breathing. However, a wound opened up in his shoulder from an attack he hadn't been quick enough to dodge. Then Muzan slammed him away from him with one of his tentacles, "how pathetic. Your useless human body can never hope to keep up with me" Muzan said, as purple splotches formed all over Giyu's body, and his veins became more pronounced.
'That Bastard, I have to keep fighting!' the Demon Slayer thought, before an attack knocked his Sword up and away from where it could guard him. As the tentacle moved in to impale him, dark red blood suddenly exploded from Muzan's stomach, a foot impaling the Demon King instead. Giyu watched in shock as Muzan's blood dripped onto the snow. Behind the Demon stood Nezuko, now recovered enough to keep fighting. Spinning, the oldest daughter of the Kamado family ripped off Muzan's head with her other leg, before delivering an axe-kick to where it had been that slammed him into the ground.
Nezuko grinned in triumph, while Giyu stood stunned silent. Muzan suddenly grabbed hold of Nezuko's leg and rose from the ground, crab-like claws in place of his hands or the tendrils. Before he could do anything more to Nezuko, Takeo and Shigeru appeared and sent a kick each to the other Demon's head, splattering it to mush and sending him slamming into another tree. "These Demons are your family?!" Giyu checked, calling back to Tanjiro, who was further back from the fight. "Yes, they are!" the 13-year-old replied. Muzan was up again in an instant, whips having grown from his body and slicing the trees around his apart.
Takeo suddenly leapt into the air, jumping off several trees to do so. Muzan lashed out at him, slicing off his right arm and leg, but they regrew in an instant. The young Demon boy, who still had the flower of his Blood Demon Art grown from his back slammed his fist into the other Demon's arms as he raised them to block, creating a huge eruption of snow and debris. Muzan swung out his whips, only to find a severed arm falling on top of him. Takeo appeared behind him, arm regrown and ready to attack. The Demon King swiped down with one of his arms to impale the young Demon boy, only to have his entire right side taken out by a huge spiked ball of bone.
Muzan grit his teeth in annoyance, as he turned to Shigeru had grown the spiked ball in place of his arm to attack him with. 'These Demons are strangely powerful for newly created whelps. I didn't even give them that much blood, so how is this possible?!' Muzan thought, slicing off Takeo's arm. The boy regrew it, his hair now a grey colour. 'As human children, the amount of blood I gave them would have either killed them, or turned them into weak Demons until they had time to fully acclimate. But this family-' his thoughts continued, eyeing Takeo and Shigeru, who both had dark pink flowers growing out of their backs.
The flowers had black outlines around the petals, but that was all he could observe, before his attention was diverted as something hit him in the arm. "Impudent brats" Muzan said, as he looked to see Hanako, who now had pastel pink hair tips and a different kind of pink flower growing out of her back. Blue and purple flowers began growing from Muzan's arm and leg, before he grew mouths there and bit them out of his body. He lashed out at the little Demon girl with a tendril, but Rokuta suddenly leapt into the air in front of the attack, blocking it. The space in front of the toddler cracked like glass, shocking Muzan.
Before he could retaliate, Nezuko lunged towards him again and slammed him into a tree with a kick. As the Demon pushed himself up, he glared at the Kamado's. 'These Demons are far too powerful to be out of my control. I have to kill them immediately.' He thought furiously. Nezuko stood in the snow, hot pink flames encasing her hands, feet and the tips of her hair, while Takeo and Shigeru stood behind their Older Sister. 'There was something about these people that infuriated and terrified me the moment I laid eyes on them' Muzan thought, eyeing the young Demons, along with the toddler, Mother and the one human member of the family.
As he did, he caught sight of something that terrified and infuriated him even more. 'Those earings'. The two older Demon boys suddenly lunged at him again from above, causing another explosion of snow as Muzan dodged the attack. "You fools! I own every drop of blood in your veins!" he cried, holding out his hand to cause his blood to destroy the traitors from the inside out. The children flinched slightly as their veins bulged, but didn't otherwise show any sign of damage. Nezuko bared her fangs in anger, before she and her two Brother's leapt to attack again.
Muzan gasped, 'did they break my curse? So quickly?' he wondered in confusion, remembering how, just moments ago, he had been able to bring the traitors to their knees. Nezuko, Takeo and Shigeru all attacked Muzan, as the whips all over his back lashed out at the children Demons. Giyu watched on in awe, while his body deteriorated, but he barely noticed that, 'those children. They're so strong. And they're actually managing to damage Muzan! And Muzan is struggling against them' he glanced over at where Tanjiro was watching the fight in worry, 'just who is this family to create such powerful Demons instantly?'
Giyu moved to continue fighting, 'I have to keep fighting too! As a Hashira, I have to do everything I can to kill Muzan while I have the chance!' he thought in determination, moving to rejoin the fight. However, as he tried to step forwards, his legs suddenly gave out, causing him to collapse to the snow. 'I can't move! What did Muzan do to me?!' Giyu thought in worry. Suddenly he felt something pierce his back. Tanjiro gasped in worry, raising his hand. Giyu looked behind him to see that Rokuta had grown a tail-like appendage and had stabbed it into his back. 'Shit!' he thought in horror. However, before he could try to at least knock the child Demon away if not kill him, he found the purple patches of skin all over his body fading, and strength returning to him.
Giyu looked down at his hand, as it returned to normal, 'my body is-' he started. Meanwhile, Muzan tried to attack Shigeru and Takeo, but the two of them dodged out of the way. 'What makes these Demon special? How could they escape my control so quickly and easily? These Demons are different. No, they're just brats after all' Takeo shot in close and landed several punches, using his speed to flit around the other Demon like an insect. 'These brats are annoyingly strong.' He severed one of Muzan's tentacles with a punch. 'Their Blood Demon Arts are annoying' Muzan thought.
'But they're still no match for me' he shot out several flesh slabs, which turned into a giant pillar with multiple mouths. As it emerged from the ground it caught the Demon boy in one of it's mouths. Takeo spat up blood, as the slabs in Muzan's body disintegrated. Before he could do anything else, Nezuko slammed a flaming kick into his chest. 'Damn these brats. They're far too much trouble' he thought. Nezuko stepped forwards and tried to hit him with a flaming kick again, but Muzan dodged and grabbed her foot. He spun her around and ripped it off, but the Demon Kamado regrew her foot in an instant and sent a powerful kick into the other Demon's chest.
He flew backwards, but grabbed onto several trees with his whips to stop his momentum. Muzan's face was stormy, but Shigeru suddenly slammed his spiked ball appendage into him, sending up a massive cloud of snow. The whips shot out of the cloud and stabbed into Shigeru's body, sending him skidding back. 'Damn it! How the hell are these pathetic brats giving me this much trouble?!' he thought furiously. Muzan tried to step forwards, but a plant had emerged from the ground and wrapped around his leg, holding him in place. Two more seeds embedded themselves in his arm as Hanako ran passed.
Muzan attacked the little Demon girl with his whips, but before they could hit, Giyu jumped in and sliced them away. "You Bastard! Stop getting in my way!" Muzan cried. Shigeru then raised his hand, before slamming it to the ground. Blue markings appeared on the ground under them, before a massive pillar of Earth with bones through it emerged from the ground and pierced the Demon King through in multiple places. 'I made a mistake coming here' Muzan thought, as Nezuko and Takeo leapt through the air to attack him. The two Siblings slammed a double strike into the enemy Demon, sending him smashing through several trees, and causing a huge blast on the mountain.
Nezuko and Takeo landed on the ground, with Giyu and Hanako behind them. 'Incredible' the Demon Slayer thought. Shigeru also stepped forwards as the snow cleared to show Muzan's burning eyes. "Enough of this" he said, as he seemingly teleported past Shigeru and Takeo, slicing them both into pieces once again. "This struggle is pathetic. You're all going to die anyway." At that moment, Giyu and Nezuko lunged at Muzan and tried to slice him with his sword and land another kick, but both attacks were blocked by Muzan's arms. Another mouth opened up in the Demon's chest, before unleashing a massive burst of energy.
Nezuko, Giyu and Hanako were all blasted away from him. A huge crater of cracked earth, cleared of snow, had been left behind, with the two Demon girls and Hashira laying on the ground. But the shockwave hadn't effected everyone. A crack formed in the air in front of Rokuta, who stood in front of Tanjiro and their Mother. The crack grew as the baby Demon held his arms out. Then it suddenly shattered, before the 'pieces' reformed into a bright blue ball of energy. Once the ball was fully formed, it began vibrating and humming with a high-pitched sound. Rokuta then shot off the ball towards Muzan. "Huh?" he said, confused by what the tiny Demon was doing.
That confusion vanished the moment the attack hit him, as he was blasted with the power of his own attack, and sent flying through several trees. Then the orb exploded with massive force. Giyu panted as he forced himself up to his knees, "what was that?" Kie knelt down by Takeo and Shigeru, gently guiding them into reattaching each of their pieces and healing. As the smoke cleared, Muzan was shown, barely a skeleton, and still on fire. "That must have been my own power reflected back at me. That brat's Blood Demon Art is far more powerful than the others" he muttered.
'This is my chance! We're closer than we've ever been to killing Muzan! I have to cut off his head now!' Giyu thought, running towards the slowly healing corpse. He leapt into the air, 'I will end this now!' Unfortunately, as he landed a Striking Tide on the Demon King, he'd already regrown most of his body. Muzan slashed out at the human with a tendril, but Nezuko blocked the attack with her flames. As he turned his attention to her, Shigeru smashed his spiked bone ball into Muzan's head. He grit his teeth in fury, shattering the ball and letting off another shockwave as his whips lashed out, "I'VE HAD ENOUGH OF YOU!" Muzan screamed.
Giyu was sent flying backwards, while Nezuko was sliced in half. Muzan panted, his hair starting to turn white from the amount of power he was using. He looked down at his arm, "what is this? Why am I so tired? These worthless traitors can't be causing me that much train, can they?" he asked himself. Catching sight of a rabbit by his feet, Muzan saw Kie fusing the bones of multiple animals together for Shigeru to use. As he watched her, Hanako shot more seeds at him, which grew into pink and blue flowers and started draining his blood again. Giyu was still on the ground, desperately reaching for his Sword. Suddenly Hanako shot at seed into his back, which grew into another black and pink flower.
Giyu realised that he could feel new strength flooding his limbs, as he finally grabbed hold of his Sword and stood up. "My strength is returning!" he said to himself. Then Nezuko grabbed hold of his Sword blade and set it ablaze with her Blood Demon Art. She vanished as Takeo sent an uppercut to Muzan's chin, sending him flying into the air for a moment, before she appeared above Muzan and slammed him into the ground with a flaming axe-kick. As Muzan let off another, albeit weaker shockwave, Giyu suddenly flowed passed with his flaming sword,
Both of his arms were sliced off and burnt, along with his whips. 'Damn them-' Muzan thought, before his thoughts were cut off as he saw Rokuta charging up another ball of energy right in front of him. As he shot the attack off, Muzan realized that he couldn't win in his weakened state and split his body into pieces before the attack could finish him off. As he exploded, Giyu noticed this, and struggled to slice all the pieces. "He's split himself! Quickly! Don't let any of the pieces escape!" ye yelled. Nezuko set many of them of fire, Takeo smashed them apart and Tanjiro tried to hit as many as he could with his broken Hatchet.
Giyu gasped and panted as he realized it was finally over. But he couldn't help the frustration welling up inside him as he realised that the monster had gotten away. "Damn," he gasped, before collapsing to his knees, his hands on his dirt, "damn it!" he groaned, furious with himself. They'd gotten so close, damn it!" As Tanjiro hurried to check on the man, blood dripped from Giyu's many wounds. With the Demon that had attacked their family gone, many of the Demon Kamado children felt their hunger hit them full force after all of the injuries they'd received. Drool dripped from Nezuko's mouth as she stared at the blood. Her Older Brother she knew, and refused to attack. But this human- he was free-game. The Demon girl lunged, "ah! Nezuko wait! Don't-" Tanjiro yelped.
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Meanwhile, a tiny piece of Muzan's head had landed somewhere in the forest. A tiny lizard examined it, but ran away as an eye opened in the flesh. Two tiny stick-like arms sprouted from the flesh as Muzan pushed himself up with much effort. 'I never thought it would be possible for my own Demon's to push me into such a state. I made a huge mistake turning that family into Demons. I should have just killed them all when I had the chance!' he thought.
'I swear. The next time I see them, I'll kill them all!' Muzan thought furiously.