I liked this series, but if this is how the ending is, rushed, and leaving many things unresolved, it would've been better if the whole series was just about teaching you how to stretch your body not your feelings
This!
That struck home, haha.
In all seriousness, though, the ending wasn't what I was expecting (shame on me for expecting more, I suppose) but it fit the pace of the story. Keiko moves on, and Ran gets as close as possible to some kind of confession without saying it outright -- it works. Look on the bright side: if there is a sequel, and if it gets translated, we have plenty of time to prepare our hearts, minds, and yuri-goggles in anticipation. I'm pretty sure a lot of us need it. Maybe we should do some stretches.