First disc is a regular CD with an unbroadcasted special, recorded at Hakone. You can see the recording set up used (iBook?) in a picture inside the back of the CD jacket. Both Koyama-san and Yuzuki-san are wearing yukata. I, of course, didn't scan it, because I wanted to keep it all to myself (and all those who bought this). As with previous radio CDs, no track titles are listed, so I made them up.
One of the interesting things, technically, is that the audio is completely raw. As far as I can tell, absolutely no dynamic range compression was applied. Funny thing is, it could actually have used some! It is very hard to listen to this using headphones, as you have to turn it up quite a bit to hear the quiet parts, but it can suddenly get really loud, too. It'd require a pretty decent set up to really enjoy this. It also has a very realistic stereo separation, with Koyama-san on the left microphone, and Yuzuki-san on the right microphone. Naturally, their voices also end up in each other's microphones, with slight delay and major attenuation. Only if music CDs sounded this good....
The audio portion of the CD feels like a teaser for the Utawarerumono Radio Memorial Book, originally released at Comiket. It is to be released again in slightly more general distribution channels soon. Unfornately, Amazon.co.jp won't ship it overseas, and all the other stores listed don't ship overseas at all, so I had to pay big bucks and order it through Himeyashop. This kind of exclusive distribution releases really get on my nerves.
The other disc is a CD-ROM with 128kbps MP3 files for radio episodes 40 through 52 + finale special, all of which were broadcasted through onsen.
Following episodes feature guests: