Tsuchiya Anna is listed, and also known as "ANNA TSUCHIYA inspi' NANA [BLACK STONES]" and Lufkin Olivia is listed as "OLIVIA inspi' REIRA [TRAPNEST]," both according to their roles in the animated series, NANA. I chose to use their real names.
First, I'm more fond of OLIVIA's songs. I like her voice better, and I'm not really into rock songs, not that ANNA's songs are all rock (e.g. track 8). Interestingly, OLIVIA's voice and Hirano Aya's voice actually have some similarities. I can almost imagine Aya-chan mimicking OLIVIA in a karaoke room or something.
Unfortunately, mixing quality is pretty bad. I'm probably not their target audience. Technically, that shouldn't matter, but again, unfortunately, it apparently does matter to the marketing people. The ever so important mid-range (where OLIVIA's wonderful vocal is at) is overshadowed by exaggerated highs and lows. And overall lack of dynamics really kills the enjoyment. Considering these are bands, one would think that live concert-like dynamics is expected, but it doesn't deliver.
Anyway, the CD comes in a keepcase with a DVD (listed separately).