You were living a peaceful life, until in that one day the apocalypse started, along with the struggle for survival. Its been a week, and your food supplies are running out. When you were in a store for goods, you were crowded by the zombies. When you thought its your end, you heard gunshots, and then zombies were down.

"Be careful next time"

A man with a gun spoke from other side of the store, and then he just walked out like nothing happened. He looked serious and cold-hearted.