Asking here as a longshot, but I was looking for a specific old MMD growth dance video. My memory is fuzzy, but I think it used the same model as this video and was to the song Sweet Devil. https://www.youtube.com/watch?v=M6P0vpjkiAk

I remember her looking into a mirror, but the Ariane (I think that is the model's name) inside the mirror was in a city and the size of buildings.