Being fan of hentai does not count for being fan of japan.
Like I said, Japan is way stricter on this than the west. Sony(who publish a good chunk of music in Japan) will actually go as far to take down certain uploads on the American Youtube site to protect copyright. I've seen it happen at least.Well, Japanese people are slow. Or they are just too lazy to upload it somewhere.
The only way anyone here could buy the album is to order a Japanese iTunes gift card from j-list or something.
http://www.nicovideo.jp/watch/nm20983374 it says u have to register to watch it, and I don't feel like registering to some random Japanese site. This is apparently the days are numbered but I haven't seen it so idk if its legitimate