In the year of 2021, a mysterious virus had suddenly appeared before mankind. It has been spreading throughout the world at a rapid pace, nearly bringing the human species to extinction and forcing humanity to barricade themselves within Monoliths. Taking place in 2031, try to survive this deadly virus!

Gastrea are infecting the human race, leaving only death and destruction in their wake. The Tokyo area is in grave danger. The sense of fear hangs in the air. The Gastrea must be eradicated, but who will answer the call? The fate of Japan is in your hands.