Yes I think a chapter is missing . I read it a long time ago. Don't know where it is but I remember the chapter was about one investigating a university Ithink his alumni or something like that and he did it without kabu.
http://myreadingmanga.info/natsume-isaku-ameiro-paradox-volume-2-eng/4/
chapter 9 complete
WTH!!! There is like 29 pages missing in chapter 9 right? otherwise that doesnt make anysense why kaburagi is mad at onoe... ?????