Two months have passed since the destruction of the massive laboratory underneath the wealthy city of Erlacai. Survivors of the catastrophe have awoken from unconsciousness in another underground structure. At the same time, a new group of people find themselves captives in this strange facility, the reasons behind their incarceration unknown. The two groups are forced to fight against hideous mutants at the behest of their mad captors. As time passes, it becomes clear that following the rules set before them will mean certain death if they do not act. Together, they form a plan for survival, each day that passes until their escape bringing them more fear, but closer to freedom.