Bishoujo Yuugi Unit Crane Game Girls

The story centers on three girls: Mirai, Ayaka, and Kyouko. The three are the only ones who can save Earth from being destroyed by a group of asteroids. They are hired by Sayo, the representative of a shadowy organization, and the organization starts work on turning them into an idol group. While the trio are more than prepared to be idols, they are instead taken into an arcade.