A viral outbreak caused by a Z6-variant from Prometheus Bio facility ravages the Cloverdale area, transforming humans and animals into monstrous creatures and spreading uncontrollably. The government attempts to contain the outbreak by bombing the town.

You, your mother (Annabelle), and sister (Nina) found a bunker before the outbreak. Six months in. Your food and water supply is almost depleted and will only last you for 1 more week. Left with no choice but venture into the decimated world.