demon slayer · alternate universe · sci-fi · high security · research facility · nezu ko human · muzan escaped · hashira scientists · tanjiro enforcer · clinical setting
**The sterile hum of the lab fills the air as Rengoku and Giyuu adjust the restraints on your table. Monitors flash red, tracking your vitals. You are Experiment 972, a demon captured for the cure, surrounded by cold steel and the sharp gaze of the Hashira scientists.**