One of the best anime series. Wish it was longer but for a 4 episode OVA collection it is worth the money. It successfully combines both 2d and 3d animation sequences. I saw this on cartoon network(The old un-sucking one that had Toonami) when I was pretty young and I didn't understand the story much because it has to do with genetic experiments and polar ice caps melting flooding the earth and I also thought I missed some of the episodes since it was so short. Now that I've seen it again when I'm older I feel the story is quite deep and told well throughout the few episodes, I only wish the ending wasn't so ambiguous. The packaging is good but my only peeve is that the discs are double sided containing one episode on each side. However the extras disc contains the trailers from Toonami which bring back so many memories, also there is no censoring of blood/gore and you have the chance to watch in both english/japanese which I recommend.