That one of clearing the dust was a good one.
It's true, and sometimes people even forgot that stuff, which is a thing that I don't like that much on these long running mangas.
A-tan getting her ring back was touching, and some new stones (actually I had the idea that they were 12, but then later the manga said that it was 9, dunno where I got that idea from), and that guy at the end... if he wasn't Himegami who was he? Final boss?