This one also comes in a keepcase and has an ISBN number (ISBN978-4-08-901160-7). I'm not sure if it's a first pressing bonus, but mine came with a postcard.
It's been 17 months since the last drama CD release, so I was somewhat surprised when I learned of the release, but didn't hesitate at all to preorder it.
Story focuses on Shimako and Noriko's first encounter. Touko also makes minor, yet high impact appearances. To me, the events seem unrealistic, but it may be due to my lack of understanding of female behaviors. If so, I must say, women are scary creatures. I felt like Yumi is the only one I can side with. Unfortunately, she's too passive, so just goes along with everything.