The premise is that Clain living in an Ireland type place, in a futuristic world where people are free to do anything because the government takes care of everything. So people use "doppels" a sort of computer program as a replacement. The main character thus lives by himself, and is interrupted one day by a girl who falls and he saves. He finds out that the perfect world the government has created, is slowly deteriorating and the girl he saved leaves behind a doppel of her own which is different, then they go on an adventure to find her among other things.
I am explaining it badly, but it's much more cool than how I describe it.