`  :I think that was a system devised by us, for us.  People were probably fighting about it in the past, and that was the hard/fast rule they came up with.  Looking on the net for RSs, the best I could find were these artilces.    Basically, they all say the same thing.  There is no hard/fast rule for deciding genre.  Might be worth mentioning.  When we discuss something that isn't obviously in a certain genre (Naruto is shonen for sure, isn't it?) then say something like ``xxx is classified as yyy by zzz`` to show that we aren't doing the deciding. -   `