The story has lots of possibility. The fact that it's from a prizewinning novel is highly promising, and Fukuyama Jun, Nazuka Kaori, and Nakahara Mai are a good start for the cast. But what makes this a must-see for me is Koshimizu Ami in the lead role. Looking at the manga, I think this could be a special role for her. She has even given Myself;Yourself a bit of strength, and I think this role could suit her down to the ground.
If you haven't read it, check out Andrew Cunningham's
novel review, linked to in NeoSam's post #1. "It's a hell of a book." "...Horo makes virtually every other character in the novels I've read this year seem one-dimensional." And not only was the novel chosen by readers as their favorite, Horo was their favorite character. Like dahl_moon, I have to say that review hooked me for sure.