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"Journey through the Decade" is the twenty-eighth single by Japanese artist Gackt. Unlike the majority of Gackt's work, this composition is by Ryo, Shoko Fujibayashi and lyrics are by Kōtarō Nakagawa. It is being used as the opening theme song for the 2009 Kamen Rider SeriesKamen Rider Decade. It was released as a single CD and as a CD coupled with a DVD with the music video.