To make matters worse, the Gaia Memories carry a dangerous toxin that cause their users to go insane to the point where they could die from the life-threatening devices. However, the Sonozaki Family sell mysterious devices resembling USB flash drives called Gaia Memories to criminals and other interested parties who use them to become monsters called Dopants, committing crimes with the police force powerless to stop them. In the ecologically-minded city of Futo ( 風都, Fūto, the ' Windy City'), where nearly everything is powered by windmills, the people live in harmony. Said series also received a stage-play adaptation titled Fuuto PI: The STAGE, which was performed from December 2022 to January 2023. The series received a sequel manga series titled Futo Tantei, which began serialization in 2017, while its anime adaptation Fuuto PI began airing in August 2022. The average rating of the series was 7.95%. The catchphrases for the series are ' We are the two-in-one Kamen Rider' ( 俺たちは/僕たちは、二人で一人の仮面ライダーさ, Ore-tachi wa/Boku-tachi wa, futari de hitori no Kamen Raidā sa) and ' This clinches it!' ( これで決まりだ!, Kore de kimari da!). The series is described as the 'Heisei Kamen Rider 10th Anniversary Project: Fall Campaign' ( 平成仮面ライダー10周年プロジェクト秋の陣, Heisei Kamen Raidā Jusshūnen Purojekuto: Aki no Jin). After Shinkenger concluded on February 7, 2010, Kamen Rider W was joined on Super Hero Time by Tensou Sentai Goseiger. The series premiered on September 6, 2009, joining Samurai Sentai Shinkenger in the Super Hero Time line-up after the finale of Kamen Rider Decade.

It is the eleventh series to debut in the Heisei Period and the twentieth overall. Kamen Rider W ( 仮面ライダーＷ（ダブル）, Kamen Raidā Daburu) is a Japanese tokusatsu drama in Toei Company's Kamen Rider Series.

For the main users of W, see Phillip and Shotaro Hidari. For the series' main character, W, see Kamen Rider Double.

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