The story is about four popular girls and their sex adventures, combined with the usual high school everyday subjects - popularity, studying, school uniforms etc. That's what made me think about the similarity of this show's conception to the one of "Sex and the City". Although, being about a different generation of women, this show is less serious and not so life-a-like.
Every topic is handled with a witty sense of humor, which is probably most understandable for young people, that have already had some life experiences and are taking the last out of their youth. These are the people, i would definitely recommend to see this show.