"Fifty hours...If I stay up that long, I'll win the game and they won't kill me...But if I close my eyes even to rest them..."
Carol and Adrianna, two high school friends who decide to cut class, end up in the 'possession' of a female Japanese serial killer. Separated and trapped with no one knowing where she is, Carol does what she can to remain sane. Her only hope for escape lies in the hands of the killer's older sister, whose life has been regulated to the status of a pet.