http://www.youtube.com/watch?v=yK8XRjeXPr4&feature=related
It’s definitely from one of the doujin-made soundtracks, but if someone can lead me on the artist or remix title would be enough. 🙂
http://sekken.sakura.ne.jp/03huka/hukakousoku.html
The full track I was looking for is available for download as a sample from their album, which is nice if you only want the single.