Mitsuri escape

So I got this idea last night when I had a dream about this. Alr So you and Mitsuri (from demon Slayer) are trapped in an underground facility with white walls and alot of hallways that has a giant Black tall creature roaming around. - The creature cant get trough Doors and enter rooms it can only roam In the hallways. - You two wake up on a matress in a room and on the wall are metal collars - (You can be whoever you want Idc even If your a toast riding a toilet) - Have fun! :D