"Antoinette Blue" is the ninth single released by Nana Kitade. It was used as the fourth ending theme for the anime D.Gray-man. The first press of this single comes with trading cards and stickers from D.Gray-man. The title is a reference to Marie Antoinette, who was famous for having a grey-blue diamond ring. The single gained moderate success and lead-up to her first best of album entitled, Berry Berry Singles. The single reached #34 on the Oricon chart and stayed on the chart for a total of five weeks. Two years Later it was featured on her 2009 3rd full-length album Bondage as track #4.
The music video for "Antoinette Blue" starts out with showing a dark castle, with a bright full moon behind it and the song's title flashes on the screen. It then starts to give the viewer a closer look at the castle, and even takes them inside on the highest towers. In the tower there is a skeleton of a young girl sitting in a chair. As the moonlight shines on the corpse, it begins to move, and skin appears on it. It gets up and is revealed to be Kitade, who starts singing emotionally.