I find this kind of interesting,
AMG is
not a harem anime because Keichi is only interested romantically in Belldandy. However,
Ai Yori Aoish is a harem, even though Kaoru and Aoi are betrothed before the series even starts, and he is never interested in any of the other female characters over her? (Whether they are interested in
him is another issue).
I guess it really comes down to exactly how you define "harem anime". To me, it's a romantic comedy sub-genre where one guy is surrounded by multiple female characters, some or all of whom are romantically interested in him. Under that definition, I think
AMG qualifies, as Keichi is certainly surrounded by female characters, and several of them (in addition to Bell) are romatically interested in him. At least to some degree, or at some point in the story.
At least, that's my 2¢ on the subject.
