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…