'Nakime, what's happening?' Muzan called in his mind while the ground beneath him shattered, wooden beams and debris flying in all directions as his bladed whips slashed wildly and clashed with Ryou.
'Nakime!' he roared in his mind again, but there was no response. No doubt, someone's controlling Nakime as he could feel the control of the Infinity Castle slipping away from her.
Muzan's eyes gleamed with deadly intent and anger, but he barely had time to dwell on it.
Ryou had closed the gap between them in an instant, his form a blur of speed. With Ikazuchi in hand, Ryou slashed through Muzan's flurry of blood blades as if they were nothing more than paper.
To Muzan's horror, he realized his bladed whips weren't regenerating. Every time Ryou slashed through them, they disintegrated into ash, vanishing completely. Forced to create more whips, Muzan could feel his energy being consumed rapidly.
It reminded him of the battle he fought Yoriichi, whose sun blade had the terrifying ability to disrupt his regeneration.
But before Ryou could launch the decisive strike, the entire Infinity Castle shook violently. The next moment, Ryou, Muzan, and the rest of the combatants found themselves ejected into the open air, landing amidst a small town.
Muzan, furious, let out an earth-shattering roar that echoed through the night. "Ahhh!" His scream sent shockwaves rippling outward, obliterating the nearby wooden houses in a massive burst of power.
The sheer force of his rage tore through the landscape, reducing everything in its path to ruins.
Ryou stood with a calm expression, unfazed by Muzan's outburst and power. Tightening his grip on Ikazuchi, he exhaled slowly and whispered, 'It's time to end this!'
Without a word, Ryou's eyes turned into the three-tomoe Sharingan while he also activated the transparent world. Instantly, the world around him sharpened, every minute detail becoming clear.
Every muscle movement, every change in Muzan's breath and body was laid bare before his eyes. He could feel the trace of weakness in Muzan. It should be because of Tamayo's drug.
"No matter how strong you are, I will kill you today," Muzan growled, his voice laced with malice. He lunged forward with blinding speed, his red-bladed tendrils slicing through the air like deadly razors.
But Ryou was faster.
He dodged Muzan's blows with ease, his Sharingan and Transparent World allowing him to predict every strike Muzan made. It was like watching a movie in slow motion, as he pressed forward.
The clash between them was so intense that the surrounding area began to resemble the aftermath of a natural disaster. Each strike sent shockwaves rippling outward, leaving craters in the ground, and ruining nearby structures.
Every Demon Slayer stood frozen, watching in awe as Ryou clashed with Muzan. The sheer intensity of the battle made their hearts race as none of them had ever witnessed such a display of power.
Their blood boiled with excitement, watching Ryou face the Demon King alone, with overwhelming strength.
Tanjiro, standing alongside Giyu, Inosuke, Kanao, and Zenitsu, watched in silence. They all shared the same thought, "So... strong."
Tamayo and Yushiro stood in the back, watching in stunned amazement. Tamayo's heart pounded, nervous yet hopeful. She knew better than anyone how impossible it was to kill Muzan, but after meeting Ryou, she began to believe it was possible.
Now, she was about to witness it unfold with her own eyes.
Kanae stood beside her sister Shinobu, her injuries slightly better with the treatment. Shinobu whispered, "Ryou-san is fighting Muzan like it's nothing... he's amazing!"
Kanae watched quietly. She knew that Ryou hadn't even shown his full strength yet.
Meanwhile, the Hashira locked in combat with Kokushibo could sense the overwhelming presence radiating from the battle between Ryou and Muzan. Despite their intense fight, it was impossible to ignore.
--
Wasting no time, Ryou activated his Nature Mode, his eyes turned golden. Infusing his sword with natural energy, he swung it in a wide arc, unleashing a devastating wave of air blades that obliterated Muzan's attacks.
The strike sliced forward with incredible speed, maintaining its momentum as it surged toward Muzan.
The sudden attack caught Muzan off guard but with extreme reflexes, he barely avoided the strike that nearly cleaved his body into two.
His eyes widened in shock. "Impossible..." Muzan muttered, startled by Ryou's sudden and overwhelming increase in power. This kind of strength is not something a human can unleash.
"No... I can't stay here any longer." Panic crept into Muzan's mind as he realized the dire situation, with his strength being affected by Tamayo's drug.
Without wasting another moment, he attempted to split himself to escape, only to find he couldn't. He quickly attributed this failure to Tamayo's drug.
"It's you, Tamayo! What did you do?!" Muzan screamed at her from a distance.
"You aren't going anywhere, Muzan," Ryou spoke. "Here I come."
Saying this, Ryou walked forward slowly, exhaling deeply. 'Nature Breathing, Ninth Form: Dance of the Void.'
This ninth form was the strongest of the Nature Breathing style, integrating all his sword movements into a single move. Time itself seemed to slow while Ryou felt the Nature energy within his body consuming rapidly.
Without wasting a moment, he dashed forward. Muzan, as the strongest demon, instinctively reacted, unleashing a flurry of blood blades in a monstrous swipe, hoping to slice Ryou apart.
But Ryou glided through the attacks effortlessly, moving as if he were a shadow, slipping past each deadly strike. In an instant, he appeared before Muzan, his sword raised high.
With a clean slash, Ryou severed Muzan's head from his body. Muzan stared wide-eyed, disbelief washing over him as even he himself couldn't comprehend how he had been beheaded so effortlessly.
'How can this be...?' he gasped.
But Ryou wasn't finished with his attack. With the Transparent World activated, he could see Muzan's seven hearts and five brains, which allowed him to regenerate without a head.
Ryou's movements became a blur, his blade slicing through the air with blinding speed. His slashes dismantled Muzan's body into numerous pieces, destroying his hearts and brains.
To Muzan's horror, apart from his severed head, his body began to disintegrate.
As his head fell to the ground, Muzan's instincts kicked in. He attempted to burrow into the earth, his only escape route, hoping to flee and regenerate.
But Ryou was faster. He drove his sword into Muzan's head, pinning him firmly against the stone wall, ensuring there was no chance of escape.
"You won't escape this time, Muzan. This is the end!" Ryou declared, his voice steady. "I won't waste my breath on useless words, knowing you have no emotions. Let me send you on your way."
Looking at Ryou, horror coursed through Muzan's body as he felt the chilling grip of death. Even in his final moments, he struggled; his head split open vertically, revealing enormous jaws filled with sharp teeth as he lunged to bite Ryou.
Balling his fist, Ryou smashed Muzan's head into a pulpy mess. But, Muzan's brain began to regenerate slowly.
Ryou wasted no time, he withdrew his sword and unleashed a relentless flurry of slashes at Muzan's head, obliterating his last brain entirely.
Even without sunlight, Muzan's head began to disintegrate into ashes, albeit slowly.
--
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