It has the Hashtag #XJAPAN in the video. I don't really get why, but anyway.
Maybe the princess just misses the good old days.
I find the "Anniversary" is a really strong and beautiful piece btw. This piece has a lot of descent and ascent, it's just like as if he tells us a huge epic story from start to the end. The melody follows that story and the back story carries on whole emotions with these powerful but gentle harmony. If we consider that this piece was wrotten in 1999, I can clearly say that this "epic story" is Yoshiki's mind after the ptsd.