As I mentioned before, I definitely prefer Momoi singing songs she wrote herself instead of doing covers of other composer's songs. In that sense, I really think "Cover Train" was a mistake. It probably wasn't a marketing mistake, though. Strange how they don't always line up.
Anyway, "Lumica" is sort of a denpa song. I actually like the coupling song more, as it's more... sensitive. I like that style of music.
Audio quality is very good on the second track (easily 4-stars), but the first track could use a bit less touch from hands of marketing engineers. It's still acceptable, especially considering this is an Avex title. Ooh, Avex bashing.