He basicly is trying to save the world. you see, he was warped into the future, so he battles these godmod enemies who have guns with a grappling chain, throwing knives, a katana, and magic.
You can basicly defeat soldiers easily, but there are guys with tanks, jets, cars, and helicopters. the game is fun to play, the story is great, but its not easy to kill all these guys. some parts are frustrating.