Anime info
-basic series info.

Manga info
-quick guide to the manga.

Episode guides
-spoiler free intros to each of the episodes.

Seiyuu
-the actors behind the characters' voices.

Soundtrack info
-info on the lovely soundtracks.

Three sisters
-spoiler free character profiles on the 3 librarian sisters. Click on the "more"-links to get more in-depth info (with minor spoilers).

Other characters
-the various persons that the sisters meet.