Rio is voiced by Nagi-senpai!

Impression so far, is that I'm glad it's not like K-ON's premise of 5 girls going about their daily lives. Nothing happened, and it doesn't look like it'll turn out to be a comedy or anything. It's filled with some mystery and intrigue. Don't know what 5 music players has to do with anything...

Hopefully it turns out good, it'd be something decent to follow, considering this season looks flimsy.