I'm a librarian who loves anime, manga, and reading a wide variety of genres.
I had thought Yamaguchi was going to milk the "look how romantically dense Katarina is" humor for all it was worth, and instead the series took a surprisingly dark and serious turn. Since this volume effectively wrapped up the "Catastrophic Bad Ends" story arc, it's hard to see what Yamaguchi might do in the next couple volumes.
I'll probably read the next volume, but I don't know that I'll be able to manage it right after having finished this one. While the writing in this volume was, in some ways, slightly improved, it was still pretty bad.