Aikatsu Planet! The Movie follows Mao Otoha, now a second-year student at Seirei Private High School, as she shines as the renowned idol Hana in Aikatsu Planet! Amidst a busy schedule post-Planet Princess Grand Prix, Mao's success is fueled by her deep connection with her fans. Touched by their support, she embarks on the heartfelt journey of expressing her gratitude through the grand 'Aikatsu Planet! Gratitude Festival'.