This CD was given out to people who spent Y3,000 or more at the onsen booth at Comic Market 76. I wasn't there, but I asked someone to get a CD for me, which happened to be Y3,000, so I got this, too.
Contains 30 MP3 files containing comments by radio personalities of current onsen.ag radio shows. Each entry is between 3 to 5 minutes. I don't listen to all of the radios on onsen.ag (that would be impractical), but I know a lot of them.
I think it's a neat little addition to my radio CD collection.