Anime: Blood+
Song: Think Twice
Artist: Eve 6
I put a lot of work into this, and I'm very happy with it. ^_^ The song (and anime) are both some of my favorites. For all Ouran fans: you must watch this, just too see how similar some of the characters are (Kai=Hikaru, Solomon=Tamaki. he's even French o.o).
The message is straightforward: Solomon, Kai, and especially Haji want others (i.e. Diva and Co.) to think twice before touching (i.e. attacking) Saya. Oh, and the Phantom gets his stalker time, too. Just listen to the lyrics. :)
DISCLAIMER: I don't own the anime or the song, but if you like them, too, you should go out and watch/buy them.