25/07/2025
Demon Slayer: Infinity Castle — Yoriichi’s Return
The Infinity Castle trembled as Nakime’s biwa strings echoed through the air, shifting halls and rooms endlessly. The Demon Slayer Corps fought desperately against the Upper Moons, their bodies bleeding, their breaths heavy. Tanjiro’s sword arm shook as he faced Akaza, his breathing ragged.
Suddenly…
The biwa stopped.
The castle fell silent.
Nakime’s eyes widened in terror. For the first time since she became a demon, her fingers refused to pluck the strings. A pressure—vast, divine, and overwhelming—filled the castle. The demons froze. Even Muzan, hidden deep within, felt it.
A single figure stepped into the castle’s center hall.
A man with long red hair, tied loosely behind his back, wearing a simple Demon Slayer uniform with a tattered haori. His eyes—calm, golden, and filled with infinite clarity—looked through every wall of the castle.
Muzan appeared, his body shaking in rage and terror.
“You… you should be dead!” Muzan’s voice cracked.
Yoriichi’s voice was soft, steady.
> “You are still alive… then my blade has more work to do.”
Before Muzan could move, Yoriichi vanished in a flash of sunlight. One breath. One strike. Muzan’s body exploded in multiple pieces, just like centuries ago. The Upper Moons screamed as they felt Muzan’s power waver.
Akaza turned his head toward Tanjiro, whispering:
> “This… is the man who scarred our master?”
Yoriichi’s blade passed through Akaza’s neck before he could blink. His head fell, eyes filled not with anger, but awe.
Kokushibo appeared, his six eyes trembling as he stared at his younger brother.
“Yoriichi… after all this time…”
For the first time in centuries, Kokushibo felt small. His demonic body shook.
Yoriichi’s eyes softened.
> “I wanted to save you… but this is the only way.”
With a single, fluid motion, Kokushibo’s body was cleaved in two. He saw a vision of their childhood, of Yoriichi’s kind smile, before turning to ash.
The remaining Hashira and Tanjiro watched in stunned silence as Yoriichi stood before Muzan’s writhing remains. He performed the Thirteenth Form of Sun Breathing continuously, each strike leaving burning marks that prevented Muzan from regenerating.
Tanjiro tried to step forward, but Giyu stopped him.
> “This isn’t a fight we can even comprehend…”
Finally, with one last breath, Yoriichi sheathed his blade.
“Begone from this world, Muzan.”
The entire Infinity Castle collapsed in a burst of sunlight-like flames as Muzan’s screams echoed for the last time.
The night was over.
The Demon Slayer Corps stood outside, under the rising sun. Tanjiro fell to his knees, tears streaming down his face.
“Who… who was that man?”
Urokodaki whispered with trembling lips:
> “That was the hero who began it all… Yoriichi Tsugikuni.”
The world was saved in a single night.
