Hato and Ruri interactions were all cute and funny, shame we didn't see more.
Shame that the serie didn't explore why Miyako choose to retire, the director mentioned she was forcing her to be an idol against her will ,but it's just a bomb dropped in late chapter never to be heard again. Did she meant for the late period or for the whole career? And how? And why did she ultimately change her mind? Maybe spending a bit less time on the moving location game (in my opinion useless after the graduation, as there is way little probability that someone could make the connection between Miyako and her grandma by checking the house propriety, keeping her inside the studio dorm could have sense before the graduation as going every day to the studio could certainly be a security risk ) and more on Miyako and the director motivations could have been a more complete story. In this way it feels like it miss a part (unless they talked about it earlier in the story, and I odn't remember, but I skimmed previous chapters and didn't find anything).
Also chapter 30 was a missed opportunity to make Asako more dependable.