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.

若松朝日（小嶋阳菜 饰）、河内娜美（高桥南 饰）和音羽雏田（峰岸南 饰）的愿望是能够成为偶像明星，为此，三人做着不懈的努力，可是却四处碰壁。一次偶然中，朝日和娜美在无意之中招惹到了黑社会，生命危在旦夕，所幸得到了演艺界著名社长鸭嘴冴子（广田玲名 饰）的帮助才得以脱险。

　　在冴子的帮助下，朝日、娜美和雏田终于能够如愿出道，然而，冴子有一个奇怪的条件，那就是她们必须以男性偶像的身份出现在粉丝面前。就这样，一支名为“假面天空”的偶像团体成立了，在奔向理想的道路上，注定充满了风雨与波折，但是，三个女孩明白，执着和坚强是她们最强大的武器。