The story takes place in Tsukino Entertainment Agency, under which there are two very active idol groups - Gravi and Procella. The members of the group are not only roommates living in the same apartment, but also competitors active on the same stage. Gravi has the energetic and lovely Shizou (voiced by Yuki Kaji), Mutsuki Hajime (voiced by Hiroki Toriumi), who has a strong leadership temperament, the amiable and lovable Kisaragi Ren (voiced by Toshiki Masuda), and the gentle, mature, steady and considerate Haru Yayoi (voiced by Tomoaki Maeno). Procella has the cold and taciturn Mizunotsuki Rei (voiced by Shota Aoi), the trustworthy Fumizuki Hai (voiced by Wataru Hatano), and the charming central air-conditioning Hazuki Yang (voiced by Tetsuya Kakihara). In the constant competition and confrontation, they also gave birth to an indestructible friendship.