man Rah Xephon was one of the first anime i watched, and i thought it was pretty good.
the parts that i still remember was aliens from a distant planet fail in their own 'tuning' and so in turned tried to co-exist with humans which had something to do with those big mecha type things and people blood turning blue. but the last thing i remember is that everything was leading towards the 'tuning' of earth.
also that time in Tokyo traveled slower than time in the outside world. so if 1 yr past in Tokyo, 10 years past on the outside. pretty much something like time dilation.
but thats all i could remember, been a yr or two since i watched it. might go and re-watch it. since at the time i thought it was a great show.