Yeah, like I used to read these small Pokemon picture books all the time and they weren't manga; plus there are the novelizations of the movies and anime episodes. (Those, actually, could probably go in the Anime/Manga section... I'm not sure.)
If the book is an original work not dealing with the anime or manga (and isn't fanfiction), then it would go best in PG, if it's based off the manga or the anime, it'd go to it's respective area.
EDIT- Anyways, now that it's done with... *Closed*