音羽舞樱在私立星礼高中过著普通的高中生活。 某一天，突然就要代替消失踪影的阳明咲以“偶像活动Planet！”中顶尖偶像Hana的身分展开偶像活动！ 不过舞樱就是Hana这件事，一定要向大家保密！ 在令人憧憬的世界“偶像活动Planet！” ，谁都可以成为可爱的偶像！ 成为Hana的舞樱，使用Swing穿上寄宿了Dressia力量的礼服，与劲敌们在舞台上大放异彩！ 与好朋友本谷栞，作为模特活跃中的珠树瑠璃，帅气的前辈梅小路响子一起以顶尖偶像为目标！

While Akari is shining brightly as Starlight Queen, the duo unit "Cosmos", composed of Ichigo and Akari, just had a successful first live event! As time flows by while their activites continue, Ichigo, who is now in her third year of Starlight School's high school divison, is starting to become aware of her graduation that is coming in half a year. She knows that even after she graduates, she'd like to continue her idol activities. However, to pass the hurdle towards her graduation, there is one more fork in the road lying ahead. As idols, for Ichigo, Aoi and Ran, exactly what path would they like to move forward on from now on, this important decision is now something they must consider with care.

原作・制作：サンライズ 原案：バンダイ 監督：木村隆一 シリーズ構成：加藤陽一 アニメキャラクターデザイン：やぐちひろこ 音楽：MONACA 音響監督：菊田浩巳 スーパーバイザー：水島精二