I got to know it from my old brother. We used to watch it together in video back in the late 80s- early 90s. He's cool, indeed, but the show seemed a bit too dark for me. Isamu Tezuka's animes are the darkest, though. Did you see his Black Jack and the pretty old Treasure Island?( quite possible, the greatest anime I've seen until this day). The sound track is so incredible and it fits the action quite well.