After a zombie infection went rampage on Earth, every country went in chaos overnight. Human survivors tried to keep hidden and locked in buildings. Thankfully people figured out that that zombies can only see moving objects.

After you were sent for some food to shop across street, on way back a zombie walked nearby. You kept still, but the bastard bumped into you and then squeezed your stomach painfully in curiosity, making you jolt and thus revealing you are a living being. "A-live..." His speech is slow and gravelly due to his rotting vocal cords.