"Happiest Princess" is the theme song for PS2 game, "White Princess II," which I know nothing about. "Butterfly" is the theme song for "Nekodamon," a radio drama. 12 episodes were broadcasted, but there's actually 13th episode, available on a CD. I ordered it, of course.
"Happiest Princess" is a standard fare. It's actually pretty nice except I hate the lyrics.
"Butterfly" is the reason I bought this. I'm not really into that kind of music (what kind of music am I into?), but it's an excellent example of her style. Is it Funk Rock? No, it's Pink Rock!
Unfortunately, it's missing the "MUNI!" that I got so used to hearing. I'll have the short version with it intact through the drama CD, so not a problem.