Read the first few pages of the Gladstone at break, but at once realized I needed the previous volumes for reference. So it's 100 Demons I'll be carrying about with me, that starts very promisingly with Ritsu dreaming of his grandfather telling him that he has to get rid of Aoarashi now he's not a guardian anymore: he's a youkai, and a dangerous one, and he threatens Ritsu's family. I await further developments.
(My ideal trifecta, FWIW, is new 100 Demons, new Aaronovitch, and new Library: which might even happen one of these days.)