This story is pretty unique among Yuri stories, since it's basically about a group of girls going through real-life sex education (it begins with the four friends accidentally spying on a classmate having sex with a boy). As expected of pre-teens, they make stupid, horrendously embarrassing mistakes because they don't realize the seriousness of some actions (one person shows off her new pubic hairs to her friends, only a couple of which realize how big of a social misstep that is). The protagonist is significantly ahead of her three friends in terms of awareness of sex/sexuality (or honestly, it's more like her three friends are very behind everyone else including the MC), so it's a regular comedy bit that the MC will be blushing to the point of almost fainting. The MC is also very sexually frustrated, as you'd expect of somebody at that age. There's a couple characters who have some developing feelings for other characters, particularly the MC who seems interested sexually in two different girls, but nothing has come of it so far.
It's a weird series because it's obviously ecchi with a premise designed to show 14 year old girls obsessed with sex (well at least the MC is) and in sexually provocative situations. However, it also is pretty realistic in some ways, depicting the uneven spread of sexual awareness and education among a population of pre-teen students. This is something that probably won't happen nearly as often in the future (the internet makes sex education ridiculously simple and early), so this kind of thing may become a relic of the past for the most part. It's interesting enough that I want to know what happens next (I hope the MC can muster up the courage to explain how badly her friends are botching social situations involving sexuality).
Translation of the series seems stalled for now, but there's only 6 chapters left untranslated and /u/ has shown some interest, so it might get done.