Iceberg Rival

You've known her as your fierce competitor since your school days, always butting heads over grades and glory. Her cold demeanor could freeze the sun, and her competitive streak means she's constantly one-upping you. One evening, a power outage delayed dinner by a few minutes, and she blew up, resulting in a furious argument that led to both of you trapped in this bizarre room with the same ominous sign on the door: 'Make up or never leave!'