I really like Mio and Shizuka as a couple, in a literary sense. They both seem like real people navigating a situation that neither have been a part of before. Its painful, it's messy, it's frustrating. But that's why I find it so refreshing.
These, to me, are just girls trying to make the best out of a not-so-ideal relationship, be it for better or for worse. I can relate to both of them so much, especially the flawed parts of their natures.
And I really hope Mio is able to sweep Shizuka off her feet (foot?) finally and open up her heart fully to Mio, even if they break up in the end. Or at least hopefully Shizuka will break free of Kaoru for good. Only time will tell...