The film for You and Idol Precure♪ (Kimi to Idol Precure♪), the 22nd main anime entry in the Precure franchise, revealed two new cast members on Sunday:

Maaya Uchida will voice the character Tera (left in image above), a red-haired girl who despises idols; and Ayane Sakura will voice Amas, the legendary goddess of Aiai Island.

The film's story is set on Aiai Island during the Super Miracle Idol Festival, the #1 idol festival in the universe. Uta and the others join idols from around the world, but Uta meets Tera, a red-haired girl who despises idols. The film previously teased the appearances of the characters from the franchise's previous two main anime entries, Soaring Sky! Pretty Cure and Wonderful Precure!
The five Precure girls (as voiced by their respective cast members) perform the "♪HiBiKi Au Uta♪" theme song.
Each filmgoer who is in junior high school or lower will receive one of two different, randomly distributed light-up Miracle Aiai Bracelets. The nationwide concert tour accompanying the film will feature the film's theme song, and participating theaters will stream the tour's final stop for live viewing.
The You and Idol Precure♪ television anime premiered on ABC TV, TV Asahi, and 22 other affiliated channels throughout Japan on February 2 at 8:30 a.m. Crunchyroll is streaming the series as it airs.
The story begins in Hanamichi Town with Uta Sakura, a second-year middle school student who loves to sing. One day while walking her dog Kyū-chan, she discovers a giant peach-like object floating down the river and encounters Purirun, a cute fairy who came looking for the legendary savior Idol Precure. Purirun's home Kirakiland is threatened by the Chokkiri gang's boss Darkiine. Just then, the "sparkle" of Hanamichi Town's residents is stolen by the Chokkiri gang. Uta proclaims, "I want to sparkle! With my song!" and transforms into Cure Idol.
Chiaki Kon (Eiga HappinessCharge PreCure! Ningyō no Kuni no Ballerina, Pretty Guardian Sailor Moon Eternal) serves as the series director, and Yoichi Kato (Wonderful Precure! The Movie!, Aikatsu!) is overseeing the series scripts. Miho Sugimoto is designing the characters. Rie Iida is designing the art, and Tong Nian Chen is directing the art. Kumiko Yanagisawa is the color key artist. Erika Fukasawa (Wonderful Precure!, Soaring Sky! Pretty Cure) and Misaki Umase (Kaina of the Great Snow Sea, To Be Hero X) are composing the music.
Sources: You and Idol Precure film's website, Comic Natalie