It's always fun to reread a favorite series with a new layer of knowledge of how events will play out. After reading the end of volume 4 of Aoi Hana (and seeing the foreshadowing in the anime),
I can't help seeing Fumi and Akira's interactions in a radically different light than the first time I read this volume. Hopefully that doesn't sound too arcane... ^^; Anyway...
In this volume, Akira, Fumi, Kyouko, Yassan, Pon-chan, and Mogii go to Kyouko's summer home, with Akira's brother
There are also a few short stories that focus on Yasuko's sisters when they attended Fujigaya, along with some of their classmates. My favorite of these stories is easily the one that ends with a subtle romance between two adult women (score! (^.^)b).
There isn't much new to say about the execution/art here. Volume 3 is excellent as usual, although I liked seeing the story shift to a different setting during the summer vacation and wedding arcs. Of course, the end takes a bit of a darker turn, but, refreshingly, without the "woe is me" histrionics that often accompany this sort of plot complication. (Probably because- thankfully- Fumi's love for Akira isn't the first time she's fallen in love with a woman.)
Even though some yuri fans have occasionally complained about some of the longer-running yuri manga being "slow" in their build-up towards the lead couple getting together, like Aoi Hana, Girl Friends, and Sasameki Koto, I can't help wondering how many non-yuri romance manga that the people who make those complaints have read as a point of comparison. For one classic example, it takes approximately 14 volumes for Kyouko and Yusaku to get together in Maison Ikkoku, even though the reader knows that they'll eventually get together from volume 1. (Don't get me started on Rumiko Takahashi's other series.) Plus, innumerable other romance manga have spent a considerable amount of time with their leads dancing a multi-volume gavotte between friendship and love. The point is that I prefer seeing more multi-volume yuri manga being written with their leads realizing and processing their feelings at a slower, more deliberate pace than the 1 to 2 volume yuri collections that many yuri fans are used to. (Granted, I enjoy many of those 1-2 volume titles as well. ^^;)
I have no idea when Akira and Fumi will get together (which I think/hope they will do eventually), but for now, I'm simply enjoying the ride. Even assuming that they don't get together, Fumi is still clearly gay whether she's part of a couple or not. (Which, imo, provides a nonpareil satisfaction that can't be found in the numerous same-sex romances found in manga and other media in which the heroine denies being interested in "women", but only in "this particular, exceptional individual who happens to be a woman.") But ideally, I'm still rooting for Fumi x Akira! ^^