Kamen Rider Girls (仮面ライダーGIRLS Kamen Raidā Gāruzu) is an idol group developed by Avex Trax and Ishimori Productions to commemorate the Kamen Rider Series' 40th anniversary in 2011. Each of the group's current members represent one of the protagonists of the Kamen Rider Series. The group made their premiere at an event featuring members of Columbia Music Entertainment's Project.R group, the musical collaboration who provides music for the Super Sentai series. The group's debut songs were "Koi no Rider Kick" (恋のライダーキック Koi no Raidā Kikku, "Love's Rider Kick") and "Heart no Henshin Belt" (♡（ハート）の変身ベルト Hāto no Henshin Beruto, "The Heart's Transformation Belt"). The group's debut songs were played on the DJ HURRY KENN Ride the Groove Internet radio program, the successor to the Wind Wave radio programs from the Kamen Rider W series. The group's debut single is "Let's Go RiderKick 2011", serving as the theme song for OOO, Den-O, All Riders: Let's Go Kamen Riders with "Koi no Rider Kick" and "Heart no Henshin Belt" as the single's B-sides. A second single titled "KAMEN RIDER V3" was released on August 3, 2011 with the PV having a cameo by Hiroshi Tanahashi.
Each of the Kamen Rider Girls wears the transformation belt used by the character they represent.
- "Let's Go RiderKick 2011" - April 20, 2011
- "KAMEN RIDER V3" - August 3, 2011
- "Saite" (咲いて, "Blooming") - March 14, 2012
- "Last Engage" - November 21, 2012
- "Just The Beginning" - February 27, 2013
- "Go get'em" - May 22, 2013
- "SSS ~Shock Shocker Shockest~" - July 24, 2013
- "E-X-A (Exciting×Attitude)" - December 25, 2013
- alteration - March 20, 2013
- exploded - March 19, 2014