is a song by Japanese rock band X Japan, released on January 23, 2008, as a digital download.
[3] In October Lionsgate released the production notes for the movie, and according to them, X Japan would perform the main theme.
", Yoshiki originally used it as an acronym for intravenous drip, although he later noticed it would fit with the movie's title.
[9] The promotional video for the song was filmed on October 22 on the rooftop of Aqua City, Odaiba, Tokyo.
[12] The group also filmed a second video for the song on January 9, 2010, on the roof of the Kodak Theatre in Hollywood, California, featuring its newest band member, Sugizo.