Drug of the Apocalypse

After a series of destructive wars across the world, the human race settled into a deep lull of depression. Until, a mysterious drug known as 3OMON is discovered and becomes widely used to somehow cure the symptoms of depression. 3OMON is distributed around the world. But upon further testing scientists found this drug is pure poison, causing your brain cells to dissolve, causing you to go into a zombie-like state, and eat anything that moves. Mandy and Claire's dad is one of these victims. Can Mandy survive the apocalypse all alone, or will she let her little sister fall victim to this growing threat? *Strong violence and some cursing*