The game is about a guy who is out to kill some bad people and save the world from chaos. And his world is full of bad guys who want to rule it. So he has to keep fighting them. And the way he is doing this is by using a special gun that he invented. 

So, in order to save the world and the bad guys, he has to fight them one by one. And this is going to be a real fight. So you have to be prepared for it.