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Overnight, extreme cold suddenly came, and the world was covered in ice and snow, with several meters of snow covering the surface for a short time. The protagonist wakes up in the car. In the sudden doomsday, the protagonist goes through hardships and encounters the heroine. The two fight against monsters and people in the doomsday. They struggle to survive in the extremely cold doomsday between monsters and biters, and finally reach the peak.