So, we got to see characters from the first three volumes again. That was cool. Also, this volume added greatly to the overall coherence of the series. Things all start to get tied together. There's even hints of some plot conflicts being resolved. Though of course, it's played for laughs. I'll keep on following the series and maybe watch the anime.
The plot did not take the direction that I wanted it to, and I personally think that would have made the story more interesting. I still like the series a lot, but it is getting a little repetitive.