The story is divided into The Strange Murder Case, The Apocalypse Arrives, and The Ghost Story Game…
In a world where technology is still underdeveloped, two serial killers appear.
One is the Blood Butterfly, the other the Red Rose. They begin investigating cases frantically,
and then launch a frenzied campaign of revenge…
But they don't know that the greatest disaster isn't the killers, but an apocalypse: natural disasters, zombies… People begin slaughtering one another in a desperate struggle to survive.
