"Imouto sae Ireba Ii" (all good as long as we have younger sister) volume 13 by Hirasaka Yomi. This volume is about the career and personal development of Miyako.
The fact that Miyako is the main focus for this volume might have been more obvious if I had gotten the regular edition since she would be right on the cover. But this is the special edition, with the special cover featuring both sharks and zombies. It's claimed (in this very volume) that if you wanted to see a ridiculous low budget B movie, the first thing you go for would be zombies and the second thing would be sharks. Well then, this volume has both sharks and zombies. It's not related to the main story at all but this is the kind of crazy stuff that makes this series fun.
Other highlights that aren't so wild includes the usual dose of industry info, particularly the relationship between novel authors and editors, and also how illustrators are assigned to particular novels. This volume also included practical advice such as "most troubles are due to lack of communication". These lessons are integrated with the story by having Miyako experience them all as a new editor, and it was very well done.
By the end of this volume, Miyako would practically lose her newbie status and become a fearsome editor in the next volume. In particular, this is the volume where Miyako was finally made aware of the special skills that she has always had all along (see also my comments for volume 8, where everyone always had what the wanted the most). Meanwhile, Haruto has made a bit more progress in his relationship toward Miyako, while Chihiro has made similar progress in her relationship with Haruto. But alas, looks like Chihiro is on the losing side, even though she is supposed to the ultimate younger sister for this series.
Next volume is the end.
Previous (2020-02-29): "Eromanga Sensei" volume 12 by Fushimi Tsukasa
Next (2020-03-18): "Imouto sae Ireba Ii" volume 14 by Hirasaka Yomi