First-pressing again comes with a small, high quality, 12-page (not including cover) doujinshi written by the three. I don't want to bother going back and listening to the radio right this moment to figure out who drew the chapter 4, but the art work is impressive!
I really like how they put the photos from each episode (15 through 30 for this CD) in the booklet. I didn't look all that carefully, but ones for episodes 16, 17, 18, and 29 are slightly different from what was posted on the web site.
There are many short flashbacks mixed in with the new recording. In a way, it's a time saver compared to the full length MP3 data, but for the price, I'd rather have the whole thing. It's questionable what percentage of the content is newly recorded. I'd say maybe around half.