As both Gackt and the Kamen Rider Series' Heisei period run had its 10th anniversary, he became involved in the 2009 edition of the franchise, "Kamen Rider Decade", to perform its theme songs. These are the first singles that were not written by him, and were released by Avex Trax and Avex Entertainment. In March, his thirtieth single and the series' opening theme, "Journey Through the Decade", was released, peaking at number two and spending 25 weeks on the charts, and certified gold by RIAJ. In August, he released the second theme single for the "Kamen Rider Decade" film "", "The Next Decade". It peaked at number four and spent nine weeks on the charts. He also appeared in the film as "Decade"s iteration of the character Jōji Yūki. The collaboration finished in January 2010 with the release of the final single, "Stay the Ride Alive", which charted the same as his previous one.