I always assumed DIRT ANGEL originated in France, since most of the songs on Ephémère are in French. The site lyricstranslate also lists them as being from France, as a non-Japanese vkei band.
That is also just interesting, as so much of vkei is the live show aspect, I'd love to see how they did their lives with only one known musician, if anyone has info on that I'd love to hear. Ephémère has been one of my fav albums for a while, I couldn't find lyric sheets for a while, so it was great practice for translating spoken French.