Well, that probably isn't helping. The first season was only 12 episodes, plus two specials, so it's worth watching to catch up. It's not chronological, though, so some of the later episodes PRECEDE earlier episodes. It does build sequentially as far as some theme elements go, though.
It's slice of life, so it's about characters and not plot. If you enjoyed Azumanga Daioh, Ichigo Mashimaro, Minami-ke, and/or Lucky Star, this should be up your alley. If action is what you want, you will probably be disappointed.>>13257313
Every episode, or never, depending on how you look at it.