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.

Hikaru Hoshina is an energetic middle school student with a love for space and the occult. As she draws constellations in her notebook, a small and fluffy creature suddenly appears from it! The creature, which she names Fuwa, turns out to be an alien with the ability to create warp holes. When Fuwa's companions, the aliens Lala Hagoromo and Prunce, arrive on Earth, they declare that they are searching for the Precure, legendary warriors who will save the universe. But an organization known as the Notraiders soon follows and attacks, intending to capture Fuwa and its power. Overcome by a desire to protect Fuwa, Hikaru finds herself transforming into Cure Star, one of the Precure that Lala and the others have been searching for! It is now up to Hikaru and the rest to fend off the Notraiders' onslaught, discover the rest of the Precure, and find the Star Color Pens, artifacts that will awaken the 12 Star Princess who keep the universe in balance.