Ichigo Hoshimiya is a regular, ordinary middle school girl. But when her best friend Aoi invites her to join the idol training academy, Starlight Academy, her whole world is turned upside down. As she encounters all kinds of rivals and learns what it takes to be an idol, she uses her Aikatsu Cards to challenge countless auditions.
Orihime proposes that Ichigo hold a concert at the stadium where she first saw Mizuki perform, which Ichigo dubs the Great Starmiya Ichigo Festival, assigning Aoi and Ran as the event's producers. Wanting to help out, Akari joins Ichigo and the others in their first strategy meeting, where they decide to make a song to fit their theme of a bright future. Following Naoto's suggestion, Ichigo, Aoi, and Ran meet up with an artist named Kanon about writing their new song. Kanon is initially uncertain as she's never written a song about other people before, but becomes interested after seeing their performance, spending the day getting to know them and agreeing to write their song. The next day, Ichigo becomes downhearted when Mizuki turns down her offer to be on stage with her, stating she is thinking about retiring as an idol. When Kanon presents her new song, Ichigo feels it needs something to express her gratitude towards Mizuki, to which Kanon makes some revisions. On the day of the event, as Ichigo grows concerned as to whether Amahane will finish her new Premium Dress on time, Akari goes off in search of Mizuki in order to get her to see Ichigo's performance. Meanwhile, as Kaede, Sakura, and Yurika try to get the Premium Dress in time for Ichigo's performance, Aoi, Ran, and Sora try to extend the concert's drama segment for as long as possible to buy enough time for them to return. With cards in hand and Mizuki in the audience, Ichigo presents the song that Kanon wrote for her and conveys her feelings towards Mizuki who, along with Akari, joins her in an encore performance. After the concert, Ichigo surpasses Mizuki on the top idol ranking, encouraging Mizuki to keep on going as an idol and giving Akari her crystal mic, before joining the others in celebration.
Narrated recap of the Aikatsu! series.
An Aikatsu! All-Star awards ceremony will take place. The film will feature songs and stages featured throughout the anime series.
Short anime screened alongside Aikatsu Stars! Movie. The film and the short will mark the first time the franchise is screening a double feature.