The OVA vs. the series Even-though the premise is the same, the story has been re-vamped. This is what makes the OVA a better watch than the series. While watching the series, I experienced a bit like too much was going on. The revisions in the OVA fixed that for me. Yes, it's a post-apocalyptic that is similar to the likes of Evangelion, Escaflowne & RaXhephon, but there's a different fight here. Most have not seen this because they are too wrapped up in the fact that it resembles older titles. In a sense, I could even say it issimilar to Voltron. This title like the others, has a specific fight. Like I don't give away the story (because others have already), I would recommend a watch of the OVA as it is only 2 episodes. If you are curious to know the difference of the series, see if this holds your attention well enough, then check out the series. Also, find the true battle in this story.