I like coming back and rereading this one once in awhile. The first time I read it I was actually fairly unsatisfied with the ending, though subsequent rereads I've changed my mind on that. I would have liked to have seen it go a bit longer though. At least a short epilogue after they've graduated would have been nice.
I'd especially like to see what Mihane ended up doing for a career after graduating. Though I'd take a guess she probably would end up working with Reika. After all, even if she didn't succeed at her own actions her ideas did save Reika's ass as Reika realizes near the end and while she's a ditz she's obviously not stupid if she managed to get into the top school in the country.
Also something short to show how things turned out for other characters (especially Katagiri succeeding at her goal and Mihane's sister being weaned off Mihane) would have been nice. Chii-chan especially didn't have a conclusion which would be kinda needed.
Also the first time i've seen a slap like that in a yuri manga when the recieving part really deserved it.
Personally I think she deserved more to be on the end of one of those body slams Aoi ended up on the receiving end of several times, lol.