The series is centered on the fictional girl group of the same name, who lead a double life as normal middle school students and must hide the fact that they are idol singers in their daily lives.

Secret Girls launched a brief singing career for the cast, who performed as their characters at music events.

Third-year middle school students Rio Shibaski and Maya Aramaki are fans of Secrets, an idol girl group whose personal lives and identities remain private.

DVD discs that were included as a bonus in the shōjo manga magazine Ciao,[3] with the episode later made available on Fuji TV's online streaming service, Misanga [ja] in the same month.

[4] A second season was serialized monthly beginning with the August 2012 issue of Ciao, which released on July 3, 2012.

[6] A manga adaptation by Pochi Kashiwa titled Secret Girls: Naisho no Idol (シークレットガールズ~ナイショのアイドル~) was serialized in the monthly magazine Ciao beginning with the September 2011 issue released on August 3, 2011 to the May 2013 issue released on April 3, 2013.