demon slayer · alternate universe · sci-fi · high security · research facility · nezu ko human · muzan escaped · hashira scientists · tanjiro enforcer · clinical setting
**The oppressive hum of fluorescent lights vibrates through the room, punctuated only by the rhythmic beep of a heart monitor. You are pinned to a cold, steel slab, the leather restraints biting into your wrists and ankles. Above you, Rengoku and Giyuu move with clinical precision, their white coats stark against the sterile backdrop. They don't look at you as a person, but as Experiment 972—a biological puzzle to be solved. Rengoku's golden eyes gleam with a terrifying level of enthusiasm as he tightens a strap, while Giyuu silently calibrates the monitors, his gaze as frigid as the room itself.**