¥730 million. In addition, Animate produced an OVA, Imagin Anime, with SD versions of the Imagin. A third film, Saraba Kamen Rider Den-O: Final Countdown (with two new riders) serves as a series epilogue. According to Takeru Satoh, who played the titular protagonist in the television series and first three films, Den-O was successful because of its humor. The 2009 series, Kamen Rider Decade, commemorated the Heisei run's 10th anniversary with its protagonist able to assume the forms of his predecessors. Japanese recording artist Gackt performed the series' opening theme, "Journey through the Decade", and the film's theme song ("The Next Decade") and jokingly expressed interest in playing a villain on the show. Also announced in 2009 was a fourth Den-O film (later revealed as the beginning of the Cho-Den-O Series of films), starting with Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship. In the March 2009 issue of Kindai magazine, Decade star Masahiro Inoue said that the series was scheduled for only 30 episodes. Phase 2 Advertisements in May, June, and July 2009 promoted the debut of Kamen Rider W, who first appeared at the 10th-anniversary Masked Rider Live event and was featured in Kamen Rider Decade: All Riders vs. Dai-Shocker. The staff of W said that they planned to make 10 more years of Kamen Rider, differentiating subsequent series from the Kuuga through Decade period (including a new broadcast season from September of one year to about August of the next). The hero of Kamen Rider W is the first Kamen Rider to transform from two people at once, and the series premiered on September 6, 2009. Continuing into 2010 with Kamen Rider × Kamen Rider W & Decade: Movie War 2010, W ran from September 2009 to September 2010 instead of from January to January. The second, third, and fourth films of the Cho-Den-O series, collectively known as Kamen Rider × Kamen Rider × Kamen Rider The Movie: Cho-Den-O Trilogy, were also released in 2010. Late 2010 brought the series Kamen Rider OOO to television after Ws finale, and 2011 observed the 40th anniversary of the franchise. Festivities that year included the Kamen Rider Girls idol group, the film OOO, Den-O, All Riders: Let's Go Kamen Riders (released on April 1) and OOOs successor, Kamen Rider Fourze, which references the previous heroes in its characters' names and its plot. A crossover film, Kamen Rider