Cyclone Effect is an ending theme (ED) from Kamen Rider W. It was performed by Labor Day (Sunaho Takeuchi & AYANO). The first of the Kamen Rider Double ending themes, which was released on November 25, 2009, on a maxi single. While the song is intended to be the theme for Kamen Rider Double CycloneJoker, the song is also played during other forms' fight scenes. An acoustic version, which titled "Cyclone Effect (acoustic edit.)" is first heard in the background of episode 21. The song is later used as the ending theme for episode 48.