People saying that this has a sexual feel and is inappropriate have no sense of creativity. It's not for you to approve whether they should have this concept. If their parents approve, so should you. I love them for not having a cutesy video.
I really can't understand what is provocative in this video... maybe there's something wrong with you! Have you ever seen a PV of an American popstar??? Just because they are young it doesn't mean they always have to behave like kawaii dolls with pink dresses and ribbons! These girls are just singing and dancing, they are very good, sweet, talented and professional... there is really nothing more in it... you are imagining too much! TGS, PLEASE KEEP UP THE EXCELLENT WORK!