America, as told by Japan.
You play as a fat kid who beats the crap out of things with a baseball bat and blows things up with his brain. You battle kung fu cops, hippies, and obese women with handbags. You heal yourself by eating burgers, fries, pizza, and cookies. I'm getting the feeling we're being mocked.
Still, it's up to a boy from Eagleland to save the world from an alien invasion, because that's one of the many sworn duties of every American. Godspeed and fuzzy pickles.