This is without a doubt the most extraordinarily ordinary yuri manga I have ever read. It's so exceptionally mediocre that it is in a class of it's own. The most adventurous it ever got was making Natsuko a bus driver (very progressive!). This manga had about as much edge and drama as the characters have noses.
If this manga was ice-cream it wouldn't even be vanilla, it would just be cream without flavoring.
If this manga was a simile it would be as bland as something that is bland.
If this story was a Greek philosopher he would be called Mediocrates.
If this story was a weather phenomenon it would be a trope-ical breeze.
As the kids these days would say, this manga is totally beyond any doubt "mid".
On a scale from 1 to 10 they would have to invent a new number between 5 and 6 just so that it can be even more average.
I have no idea how it lasted over 60 chapters, but it all blurred together so much that my brain may just have skipped a decimal.
What I am trying to say is...
It's ok.