This book actually came out in December and I knew of it’s existence then but didn’t order it until January. It was some good timing because I ordered it from CDJapan (since Hobbysearch and Amiami, my first choices, were both sold out) and shortly after it was listed as out of print.
I thought the idea of them having to dedicate a book solely to SayaKyou (there exists a MadoHomu one but who cares about that) after the movie kind of silly and adorable. Well, considering the content of the movie and all. There’s one scene that just, for me, bumped the pairing from undertone to pretty much canon.
So my curiosity got the best of me. It didn’t hurt that the book was only like 1500yen and came with a few extra goodies.
Very small spoilers for the Rebellion movie follow.