This one also comes in a keepcase and has an ISBN number (ISBN4-08-909145-4).
For the most part, this isn't very different from the anime. The only part that stood out was where Chisato tells Yoshino about her date with Rei. In the anime, it was simply about Rei mistakenly calling Chisato, Yoshino, but in the audio drama, it's a lot more complicated and intense.
First pressing comes with a continuing set of refrigerator magnets.