After the return of foreign student Aira, the Nijigasaki High School Idol Club receives an invitation to the prestigious School Idol Grand Prix (GPX) – a solo competition where idols perform on a streaming app to determine the most popular school idol. Eager to compete, six club members – Ayumu, Kasumi, Shizuku, Kanata, Emma, and Lanzhu – head to the Okinawan venue, where they’re greeted by the island’s stunning natural beauty. Amidst the vibrant atmosphere, the girls join other talented idols from across Japan, each giving it their all. However, Ayumu struggles with the idea of directly competing against her close friends to climb the ranks. What challenges and triumphs await these determined young idols as they pursue their dreams on the grand stage?