This CD features a special session with Yamakawa Kotomi as the guest.
Main recording was set up well this time, and it's hardly compressed. It does clip occasionally (when they're clapping, for example), but that's not an issue at all. Some of the pre-recorded tracks like the title calls clip slightly, too, which is a bit disappointing.
Yamakawa-san doesn't really add much to this. If anything she probably doesn't belong here. At least it feels that way, which is actually kind of interesting.
I don't think there's an easy way to buy this from outside of Japan. I got mine through someone who came to Fanime from Japan, hence the late arrival. He's also helping me get the bonus CD and cardboard box for the 4 CDs. Ahem!