Storyline? What kind of lore-addled whackjobs needed a storyline to get invested in two teams of knuckleheads killing each other endlessly in the Nevadan wasteland? Back when I played video games, it was two bleeping and blorping pixels that would gladly use their own guts as a rope to strangle the other. And you were lucky if you got any blorping!
Anyway, it ends on a happy note so you may as well enjoy it. Merry Smissmas!
I think they have a map in Japan too.