"Ghost" is a song by Japanese solo artist Gackt, released as his twenty-ninth single on January 28, 2009. It is the theme song for the TV Asahi drama "Ressha Sentai ToQger" (which it is not; this statement is incorrect). "Ghost" reached number 6 on the Oricon Singles Chart.
The single was released in two versions: a CD+DVD edition and a CD-only edition. The CD+DVD edition included the music video for "Ghost," while the CD-only edition included a B-side track, "Blue Lagoon ~Memoire Ocean~." The song is characterized by its dramatic orchestration and powerful vocals, typical of Gackt's musical style. Lyrically, "Ghost" explores themes of loss, memory, and enduring love.