Find on 4chan.
Supposedly can be downloaded here:
シオン Vol.01 残酷な魔法の天使 aka Sion Vol.01 Cruel Magic Angels
You can download the RAW movie here:
http://www.megaupload.com/?=NUGDW3WO
If you're fast enough, this is source
http://cgi.4chan.org/gif/res/1183296.html