From wiki:
Lucky ☆ Star's story portrays the lives of several school girls
attending a Japanese high school with a very loose humor tone. The
main heroine is Konata Izumi, an athletic and intelligent girl who,
despite these attributes, is not in a sports club, and has low
grades. Her laziness at school is due to her love for anime and
video games and lack of interest in anything else. The
serialization began with the four main characters in their first
year of high school: Konata Izumi, Kagami Hiiragi, Tsukasa Hiiragi,
and Miyuki Takara. As the story progresses, they move onto their
second and third year.
So, who's keeping up with this? 