Aine Yuuki, who is a regular student at Star Harmony Academy's normal division, meets Mio Minato from the idol division, who invites her to join Aikatsu to fulfill Aine's goal to make friends. She also befriends Maika Chōno and Ema Hinata who are also idols. Aine and Mio form a pair to become best friends to become the bright "Diamond Friends". Karen Kamishiro and Mirai Asuku are categorized as "Diamond Friends" and are in the Diamond Class! (Source: Wikipedia)

Yume Nijino has been accepted into Four Stars academy, home of the beautiful and talented S4 idol group. She and the other newcomers are determined to discover their talent, with a choice of specializing in beauty, singing, dancing, or drama. A tough road lies ahead of them, and they must rely on each other to overcome their weaknesses and develop their unique strengths. At the first-years' opening performances, Yume performs stellarly but faints and is unable to remember being on stage at all. Struggling to find her talent, she meets Rola "Laura" Sakuraba, and the two develop a friendly rivalry, working together to learn and improve. Though they have their differences, all the students share the same goal: to become the next S4 idol. But hard work and determination, along with teamwork, are needed if they want to join the elite S4.

Cheerful teenager Ichika Usami has a passion for sweets that is inspired by her mother's baking. In celebration of her mother's return from overseas, she tries her hand at making a cake herself. She is interrupted when a dog-like fairy named Pekorin crashes into her kitchen. With Pekorin's help, Ichika successfully bakes her cake. Only then enters an imp named Gummy who bursts in and attempt to steal the cake's "kirakiraru", a magical power that gives sweets the ability to bring happiness. Though Ichika initially offers her cake to Gummy in order to protect Pekorin, the fairy helps her realize how important the treat is and the love it represents. As the kirakiraru within Ichika's cake grows, it changes into a set of trinkets that transforms her into Cure Whip, a hero known as a Pretty Cure. Using her newfound powers, she goes on to battle kirakiraru thieves whenever they appear. Ichika fights to protect Ichigozaka's sweets and finds colorful new allies along the way.

It's her first day at a new school, and the cheerful Hana Nono is ready to make a fresh start, dreaming of becoming mature and reliable—a far cry from her usual childish self. Although she makes a disastrous first impression, Hana soon befriends two of her classmates: the gentle and studious class representative Saaya Yakushiji, and a cool and mysterious girl Homare Kagayaki. That night, a magical baby falls from the sky right onto Hana's balcony. She is immediately smitten with her and names her Hug-tan. Alongside Hug-tan is a snarky talking hamster, Hariham Harry, who mutters that Hana "isn't the one" before vanishing with the baby. The next day, Hana believes the encounter to be a dream, until people all over the city begin collapsing and a giant monster appears, feeding on their energy. As Hana escapes, she spots Hug-tan and Harry under attack. Making a stand to protect them, she and Hug-tan suddenly both glow with energy and a heart-shaped gem forms. With the crystal's power, Hana transforms into a hero called "Cure Yell" and defeats the monster. Surprised at Hana's power, Harry explains that he and Hug-tan came from a future frozen in time by the Criasu Corporation, the same organization that created the monster. Only the Future Crystals, manifestations of one's hopes and dreams, and the Precure they create have a chance at defeating Criasu and saving the future!