Three years after the events of “Pretty Rhythm: Aurora Dream,” Aira, Mion, and Rizumu have grown up and tutor a new group of aspiring idols: Karin, Reina, Mia, and Ayami, who form the Prizmmy☆. Teenage girls from Korea, named Somin, Shiyoon, Haein, Chaekyung, and Jae Eun (who are the PURETTY), appear as a rival group.