I'm wondering how old your students are. I asked my children (8 and 6) whether AKB48 were popular with boys and girls in their class and they weren't with either.
Mike Cash - you're absolutely right, if cartoons weren't made to sell the merchandise, there'd be far fewer of them around, though it still grates that a children's program is being used to promote the rather sordid AKB48 business, whose main audience seem to be adult men.