This is a great introduction to what could have been an excellent series, unfortunately never finished. Animation is a little primitive to todays standards but enjoyable all the same. Great original story as well as great characters. There is a sequel which continues the story but unfortunately that doesn't conclude anything. A sequel was recently made which is just awful and barely follows on from the others with any sense what so ever it also has awful subs and isn't that easy to get hold of (Amon: apocolypse of devilman.)This also doesn't conclude the series but it is definately still worth watching the first 2 parts (demon birth, demon bird.)