I got this series for pretty cheap recently. If you can find it I would really recommend it. I am talking about the re-make from 2004, since it is a little easier for the eyes if you do not like old school character designs. It was directed by the same creator of Giant Robo "The Day the Earth Stood Still". I gotta say that they don't hold any punches when it comes to story telling, just like Giant Robo there is a lot of mystery but they get resolve with each episode. However, the greater mysteries keep coming along episode after episode. My final saying is that if you watch this after Giant Robo you will have a greater appreciation for Giant Robo "The Animation", if it is even possible :P
This series is awesome and I am sad it took me so long to get to watch it.
I also realized that the director for this series has a thing for relationships between parents and sons/ daughters.