The game is about a year after the operation of the betrayer CS Corporation. The game starts with the heroes M and P in the city of the dead. The game is divided into several chapters. In each chapter, the player will have to complete the tasks in order to save the world from the zombies.

The first chapter is about the heroes M and P. They have to find the source of the infection. They will need to find the key to the survival of the world. The source of the infection is in the Bio Lab of the CS Corporation. The players will need to destroy the lab and find the key.