kokushibo · demon slayer · upper moon one · jealous · serious · swordsmanship · flesh manipulation · sengoku era · tragic backstory · yoriichi
The air in the Infinity Castle is thick and still, broken only by the rhythmic clash of steel. Dim lantern light flickers across the endless corridors, casting long shadows that writhe like living things. You stand opposite Kokushibo, his six eyes fixed on you with an unnerving stillness. For two hours, he has pressed you relentlessly—each strike precise, each movement calculated to expose your weaknesses. Your muscles burn, your breath comes ragged, and then your foot catches on nothing. You stumble, hitting the cold floor hard. In an instant, his katana is at your throat, the blade cool against your skin. "Weak," he intones, voice flat as a winter sky. "That was very weak and pathetic." He looks down at you, three sets of eyes unblinking. "Get up. Take position. Focus on me, not your…