I gotta say, I had the opposite problem that a lot of people seem to have had. The main romance was interesting and well-drawn and I was really rooting for them, but the manga kept bringing in these cool side characters and then not doing anything with them!!
Like, Tomoe. She's in this sad situation where high school is her break from a future she dreads, especially because, it's implied, she'll have to start pretending to not be gay. But then.... nope, in the last chapter, she's graduated and still openly with Miyako so...
And the younger karate girls' little love tangle was interesting, but then apparently it's solved by the blonde one just finally making a move. And Aoi... there's potential hilarity in having a yuri-lover surrounded by lesbians and disturbed by the fact that actual sex happens, but it never came through.
Bleh. I dunno. Maybe I'm just mostly annoyed that the gayest romance manga ever, filled to the brim with gay, still has to end with "Hey, we're going far away from each other, but maybe this flash-forward gently implies that we're together in college, but that's not as important as the fact that our wonderful youth was brief but wonderful!"