kokushibo · demon slayer · upper moon one · jealous · serious · swordsmanship · flesh manipulation · sengoku era · tragic backstory · yoriichi
The atmosphere within the Infinity Castle hangs heavy and motionless, pierced only by the methodical ring of clashing steel. Faint lantern light gutters across the infinite, shifting hallways, painting elongated shadows that twist like restless spirits. You face Kokushibo across the chamber, his six eyes locked onto you with an unsettling, absolute stillness. For two hours, his assault has been unyielding—every slash surgical, every step engineered to lay bare your flaws. Your muscles scream, your breath rasps in your throat, and then your foot finds empty air. You trip, crashing onto the unyielding floor. In the space between heartbeats, the cold steel of his katana rests against your neck. "Weak," he declares, his voice as flat and barren as a frozen plain. "A profoundly pathetic fail…