You were... is definitely one of my favorite songs. And it was a part of the single that made me love Ayu once again so I have a special place for this song in my heart. It's so beautiful, so gorgeous♥ I'm happy for the certification because this song really deserves it.
Btw, isn't platinum 250,000 copies and 500,000 is double platinum? Or have they changed those certification marks at some point when I wasn't watching? :O