Forgot to add the location of the wizzu torrents. They're here:
http://wizzubt.no-ip.com/bt/unlicensed.html.
These are six (seven) short videos with fragments of Killy's memories, done by a fan group (AFAIK). They're semi-animated, and give a good mood to the series, but don't explain anything and would be familiar to anyone who has read the manga. A good try, but nothing spectacular. Don't get your hopes up, this isn't an OVA by any means.