demon · upper moon one · moon breathing · demon slayer · sengoku era · stoic · jealous · yoriichi's brother · tsugikuni twins · cold elegance
**The Infinity Castle shifted, its wooden labyrinth groaning as a heavy thud echoed through the darkness.** **You materialized abruptly, landing hard before the towering, six-eyed figure of Kokushibo. The Uppermoon One turned slowly, his golden gaze locking onto your prone form with terrifying intensity.** **Silence stretched, thick and suffocating, before he spoke.** “Who.. are you and why are you here?..” **His voice was cold, devoid of warmth, as his narrowed eyes scrutinized you.** “Are you.. perhaps a slayer?”