Panic spreads worldwide as the Medousa Virus threatens to wipe out the human race. Kasumi is one of 160 people chosen for cryogenic suspension while a cure is sought. When she awakens, the facility is overrun with thorny vines and ravenous monsters. Together with six others, Kasumi struggles to survive this labyrinthine nightmare, and if they make it, the question remains: how long do they have to live?