as far as I can tell it was originally from
http://www.j-hp.com/hounyou-oukoku/index1/ but the links from there are all dead now, i had a quick look at some japanese porn blogs and came up with this
http://pix.asg.to/contentsPage.html?...l5sTDMjNYmoWMr but no videos.
I possibly have a few sample vids saved, but I think I would struggle to find them without filenames.