A bit rough drawing and rough story telling, but strangely, the roughness works positively for this book. Yes, it's a teacher & student yuri, but both characters are a bit unusual. Nanao, for example, is a tsundere with the emphasis on thun. Nanao generally does not use keigo (honorific form of Japanese) when talking to the teacher, so you get the impression that Nanao is (emotionally) strong one between the two. Reality is a bit more complicated.
It has a happy ending... I think ;)
