The School Idol GPX (Grand Prix) to determine "The Most Supportable School Idol Right Now." To participate in this event, which saw massive excitement in Okinawa, six members—Karin, Ai, Setsuna, Rina, Shioriko, and Mia—simultaneously visit another venue. In Kyoto, where ancient culture breathes; Osaka, overflowing with warmth and energy; and the port city of Kobe, filled with exotic charm. Against the backdrop of these three cities, the six begin their respective activities. At that moment, Mia—who enjoys being a school idol as a member of the club—is confronted by her older sister, Chloe Taylor. Meanwhile, Nana Nakagawa, who strives to be her ideal self, "Yuuki Setsuna," within limited time, faces a certain dilemma—. As the personal feelings of each club member become intertwined, the School Idol GPX grows even more heated than anticipated… The youth school drama woven by twelve girls and one more, Chapter 2. Another story of heart-pounding excitement, begins now—.