Those three stories were actually in the first book. Here's my guess if they choose to do two books.
Novel 1: 2-2-3 eps
Novel 2: 6 eps
I nabbed some images from the author's official website. The novels have covers by two different illustrators. Akatsuki Katoh for the Bungeisha edition and Suzuki Yasushi for the Kadokawa Shoten edition.
ps. pd_yakumo @ LJ exists
