Video sequences from otome games (anime dating games for girls). Mostly openings (OP) but maybe ending videos as well. Usually in Japanese! Pretty music, pretty pictures.
Um, I just wanted to mention the Ar Tonelico series are technically Otome Games too. It's an RPG, but there's otome elements in it, since the game mainly revolves deepening your relationship with one of three girls.The social part is a lot like normal otome games, 'choices',points, etc.Just thought you should add it into the games section if it meets your criteria ;D