basically the future has people who are fully cybernetic, or half human half cyber. the ghosts are sort of like the soul of the person, or something very much like that. i cant fully remember, as it is the series and second movie i was watching.
it can make your mind bend a little bit to keep up with what they talk about, but great none-the-less. plus amazing animation.
glad too of made you confused with what i said. so its not just in public view that i can confuse people. 
lewis