I only skimmed the chapter, but judging by the comments and what I saw, the author went right back to giving major spotlight time to the Mob Squad. Mone-san showed up in only five panels, and one of them was just her head in chibi form. I just can't understand this guy.
I really can't: I visited his Twitter, in the past, and saw a tweet that indicates he's a fan of exactly the kind of girl Mone-san is. So why bastardize your own manga about such an ideal girl (rare as it is for having such a girl as the lead) with that much fixation on mobs whose (inferior) character traits are the spotlight of countless manga aside from this one?
EDIT: Just read it. The chapter was full of blatant contrivance (e.g., the treasure hunt, the gust of wind); special note goes to Haruta, who went from Mr. Boombastic in the previous chapter to your average, spineless, milquetoast Japanese male MC who--when he's in front of a girl--can't tell her "no" or remember he's already got a girlfriend under any circumstances.