Mendol ~ Ikemen Aidoru(2008)

Mendol is the story of three girls named Asahi, Nami, and Hinata, aspiring idols who have repeatedly failed in their auditions. One day, they witness a serious crime, and they are forced to flee from the culprits. Fortunately, they are saved by a producer who is willing to let them debut, but they have to hide their true identities and dress up as boys instead.