When a series of shocking murders strikes Corinne's apartment building, the entire complex is teleported to a hell dimension. Corinne needs to escape before she and the other residents lose their humanity and transform into monsters. Staying human means talking to people — something Corinne has always avoided. But survival means crawling through vents, deciphering cursed artifacts, and traveling through time. Emotional survival takes center stage: having the biggest gun matters far less than deciding whether you would pull the trigger if your best friend becomes a monster.