SixGravity (commonly known as Gravi) and Procellarum (commonly known as Procella), two idol groups under Tsukino Entertainment Agency, are competing brother groups. They live together in Tsukino Dormitory in Tokyo, competing and fighting against each other as rookie idols! The shining appearance of the boys when they work hard in idol activities, as well as their real appearance in ordinary daily life, are all presented here. - The daily idol story of Gravi and Procella is about to begin.