A craze general wanted to rule the world, so he have some scientist to create the super solder serum. Unfortunately, it was a mistake as the serum turns humans into zombies. Now, the world is filled with the undead. You, just want to save your sister as she is somehow involve in this. You need to save the people from the zombies. You also need to collect stuff on the road while you are fighting. Those stuff means money for you and you can buy better weapons with the money. The game would be harder as you make some progress, so you need to buy better weapons.