The full DVD is on archive.org !
Some already pointed out, that there's a low quality download of the american cut, but there's also what seems to be a full length >6GB download in DVD quality!
http://www.archive.org/details/Virus*_*F*u*k*katsu_no_hi
Stupid imdb beeps away the URL, because it contains the F-word... so you have to remove those *.
There are also some smaller versions. They say it's public domain, so it would be legal to download it. :-)