You can tell from the first two seconds of Hours that it isn't going to be like any other rock album. Some songs don't even have guitars in them, but still manage to sound like rock, for example my favourite track Aeva and the Waving World which inspired a short story of mine.
I originally found this manga by its anime. The art was nice, and the main female protagonist, Yukana had something about her... something so rare in female anime character expression. Yukana had confidence.