When the "Nirvana" virus tore civilization into pieces, logistics engineer Chen Mu and his companions struggled to survive in a mountain of corpses and a sea of blood. They gradually discovered that the deadly virus was not a natural disaster, but a cruel screening experiment called "Ark". From the fallen city to the hypocritical survivor base, they were forced to become "observation samples" in the test of blood and fire. When a glimmer of light finally emerged after sacrifice, the cold mechanical sound sounded again on the radio:
"The first phase is over. Congratulations on passing. But... The liquidators are on their way."
