The School Idol GPX (Grand Prix) is held to decide the “Most Promotable School Idol of the Year”. Karin, Ai, Setsuna, Rina, Shioriko, and Mia go to another location at the same time to take part in the event, which was a big success in Okinawa. Kobe is a port city with an exotic feel, Osaka is warm and energetic, and Kyoto is a place where ancient culture flourishes. In these three cities, the six girls start their own activities. Mia is enjoying being a school idol when her older sister, Chloe Taylor, approaches her. In the meantime, Nakagawa Nana, who is spending her little time acting as her ideal “Yuki Setsuna,” is having trouble. The emotions of every club member participating make School Idol GPX more thrilling than anticipated. 12 idols and a girl weave the second chapter of the youth school drama. Another thrilling story begins.