mikegnesium
All i've seen so far is romantic two girl friendship trope, so no yuri yet. And it's fine if it'll stay that way - not everything is about eros, nor it should be.
Btw, loving the title.
Yuri does not denote sexual content, it is the actual term for a female homosexual relationship. Shoujo ai as a term and/or genre was created by English yuri fans if I remember correctly, for some reason. The Japanese just use the term yuri. Or at least they did, I'm not sure if that's changed in recent years. Regardless, a story can be yuri without having any sexual content in it. And this is most definitely yuri, since Koyuki has definitely been conscious of Konatsu since she first saw her, and they're only getting closer and closer.
Honestly, I hope we'll get a confession sometime soon, and then continue the story, because this couple would definitely work better with trying to figure out the ins and outs of being girlfriends than just ending the series with a confession like some do.