A mysterious virus, nicknamed Medusa, is spreading around the world, turning its victims into stone. Given the impossibility of finding an immediate cure, a corporation offers to cryo-preserve a select group of patients until they come up with a solution. Kasumi, one of the chosen ones, wakes up after being asleep for an unknown period of time and her awakening, not a bed of roses, is a bed of thorns, and happens in the midst of total chaos where monstrous creatures lie in wait all around.
