These people are absolutely right. If you find it impossible to forgive a stationary story, or have grown bored with the setup and wish to know if this volume veers off into a new direction, keep on walking. It hasn't, and with every volume of The Wallflower released, it seems less likely it ever will. But that's not necessarily a bad thing. Those who can appreciate comedy for comedy's sake along with some interesting drama and entertaining characters will find a lot to like here.
Volume 9 is dominated by two main story arcs: the Landlady's increased pressure on Sunako to become normal, and a surprisingly in-depth examination of Kyouhei's past. The former is particularly interesting, as Sunako's aunt has always been a very flamboyant and interesting character, and she's given a lot to work with here. Kyouhei's story is a little more mundane, but manages to remain interesting thanks to the insane extremes the townspeople from his hometown go through.
Part of The Wallflower that I find most interesting - surprisingly enough - is the section at the end where the author writes about herself. Not only is it quite long, the notes themselves are more than the typical thanks to friends and editors usually found in manga. These segments really give the reader an impression of the kind of person Miss Hayakawa is, and are quite entertaining in their own right. It's surprising that they are translated at all, given the amount of Japanese pop culture references and discussion, but thankfully an ignorance of those subjects is not a handicap. I can honestly say that with every new volume, I actually look forward to the author's notes at the end, and that's a very rare occurrence.
The Wallflower is not for everyone. Glacial doesn't even begin to describe how slowly the plot moves; 'absolutely stationary' would be a far better choice. The art has its ups and downs, and seeing too much of tiny Sunako causes a surprising amount of frustration. For those who do enjoy it, and I suppose I count myself among them, Volume 9 is particularly interesting. It manages to transcend its disjointed nature by throwing a few large(ish) story arcs at us, and almost makes it seem as if the story is really moving. And that is good enough for me.