I've been following this manga series from volume 1 and am so glad this volume made it to press! However, stopping the main storyline to focus on Marie-chan (especially as the chapter ends in the beginning of the sting operation) as the last chapter of the volume is very frustrating. I understand that this manga series is based on a great novel series (hence the subplots given relatively large amounts of manga space) but I haven't seen any indication (advertisements in the back of the manga, for instance) that another volume will be coming out.
I really love Yumi-san's depiction of this novel series! She seems to have toned down her drawings well (the characters don't look so very stretched out as they did in volume 7) and is still keeping faithful to Doumou-kun being shorter than Kasahara-san. Hopefully the manga fanbase won't be left hanging for her finishing up the main storyline.