At first sight this is yet another highschool anime with lots of excuses for 'fanservice', but there is a lot more going on. The 'fanservice' is part of the plot, the main character is a tired cynic (unusual), and most importantly there is a clever plot that ties all the episodes together, and that poses some interesting questions. The episodes are deliberately non-chronological, and it is certainly worth watching the series again in chronological order.
The series is worth watching carefully, because there are a lot of casual hints in there that foreshadow and explain things, plus a good number of in-jokes about other series, anime and other.
The series is worth watching carefully, because there are a lot of casual hints in there that foreshadow and explain things, plus a good number of in-jokes about other series, anime and other.