KKM is indeed a light novel series that was made into an anime! The light novels aren't available anywhere in english beyond a few bits fans have translated around the internet, however, so I'm playing from the anime version (and there's a fairly significant difference too, since from when I've heard, Sara has a twin brother in the novel version...).

And ahskfjhsajgfkas jealously, I want some Eva Unit models but I never find any at cons...