Go! Princess PreCure

The girls visit a seaside resort owned by Minami's older brother, Wataru, where they meet Minami's dolphin friend, Tina, and learn more about her aspirations to carry on the family business. Pained by the bonds shared between Minami and her brother, Twilight has Lock target Wataru to create an Orca Zetsuborg, while Shut creates Octopus Zetsuborg to fight against Haruka and Kirara, who learn of a Dress-Up Key nearby. As Minami struggles against the Orca Zetsuborg, she is protected by Tina, who once saved her life when she was young. Determined to save Tina, Minami awakens the power of the Bubble Miracle Dress-Up Key, allowing her to heal Tina's injuries and help the Cures defeat both Zetsuborgs.

Noble Academy prepares for Family Day, in which the students' families are invited on campus, with Haruka eager to see both her parents and her little sister Momoka. To her shock, however, Haruka finds that Momoka seems to show little interest in the school and is acting coldly towards Haruka and her friends. When Haruka scolds her for being rude to her friends, Momoka lashes out at her and runs off, with Minami theorising that she may be lonely due to living apart from her big sister. Kirara manages to catch up to Momoka and assure her that Haruka still cares about her dearly, allowing the two sisters to make up. Just then, Twilight and Shut appear and target Haruka's family to create a Dorayaki Zetsuborg. Finding a handmade tiara that Momoka had made for her, Haruka finds the strength to stand up to the Zetsuborg and defeat it, determined to do her best with her family's support.

As Yui decides to help the Cures in any way she can, Kirara is offered a gig as a television reporter trying new flavors of donuts. However, the show's regular reporter, Ranko Ichijou, is less than pleased about working alongside Kirara and keeps trying to hog the limelight for herself. The two reporters are put in a battle to decide who gets to sample a new flavor. After Ranko wins a mascot design contest and Kirara wins a reporting contest, they are both pitted against each other in a race dressed as the mascots they designed. Kirara wins the race, but Ranko's determined to keep going even after falling at the finish line inspires the crowd. Just then, Shut targets Ranko and creates a Donut Zetsuborg, whose doughy texture proves challenging. However, using the Crystal Princess Rods, the Cures manage to defeat the Zetsuborg. Afterwards, Kirara has newfound respect for Ranko, who turns out to be one of her upperclassmen.

Kanata informs the girls of a Dress-Up Key located somewhere on Noble Academy's campus in a "place where dreams are overflowing". Hearing rumors that the dorm mother, Shirogane, possesses a unique key herself, Haruka and the others follow her through a secret passageway leading to a beautiful rose garden. There, they come across a windmill where Shirogane has kept plaques of all the graduated students' dreams, which shine when Shirogane uses her key to open up the windows. Just as the Dress-Up Keys react to the dreams, Close suddenly appears and uses all the graduates' dreams to turn the windmill into a Zetsuborg, trapping Shirogane inside. Discovering Yui has followed them, the girls reveal their identities as Pretty Cures in order to protect her. Although Haruka's purifying attack initially fails, the Cures' remain determined to protect the captured dreams and combine their powers to defeat the Zetsuborg, receiving new Elegant Dress-Up Keys in the process. As Dyspear suddenly appears before Close and the Cures, Kanata prepares to send some magical items to the Cures.

Hearing about the upcoming Noble Party, Haruka decides to try her hand at making her own dress under Miss Shamour's instruction. While managing to come up with a design, Haruka struggles with the sewing aspect. When her grades start slipping as a result, Haruka is told by Minami to stop making the dress and focus on her studies, but Haruka instead decides to try and work extra hard to accomplish both. Overworking herself enough as it is, Haruka feels compelled to remake her dress from scratch after Puff spills some tea on it, prompting worry from Kirara, who feels she can't do it alone with the time she has left. After hearing from Minami about how Haruka is working hard to accomplish her dream with her own power, Kirara tries not to involve Haruka when Lock appears with an Oven Zetsuborg. However, Haruka steps in anyway, stating that despite how tired she is, she is determined to work hard for the sake of her friends. After defeating the Zetsuborg, Haruka finally finishes her dress, thanking Kirara for worrying about her.

With the Cures gathered together, Aroma announces that the girls must aim to become Grand Princesses, using the Princess Lesson Pad to call forth a fairy teacher named Miss Shamour. While Minami and Kirara show good promise in tea party etiquette, Haruka struggles to live up to the princess she admired in her storybooks. After their lessons, the girls are contacted by Kanata, who explains how Dys Dark took over the Hope Kingdom and trapped the dreams of all of its citizens. To fight this, Kanata instructs the girls to find the nine remaining Dress Up Keys, which spread across Earth when Dys Dark attacked, and use their power to become Grand Princesses. Their discussion is soon interrupted by the arrival of Dys Dark's third emmissary, Lock, who brings out a Baseball Zetsuborg. Using the courage Kanata gave her, Haruka manages to prove her worth and defeat the Zetsuborg.

Haruka and Minami discover that Kirara Amanogawa, a fashion model who has also enrolled at Noble Academy, has the missing Princess Perfume in her possession. Curious as to if she is the third PreCure, Haruka and Minami go into the city where Kirara is working to try and talk to her. However, they are interrupted when Close appears with a Camera Zetsuborg, which the Cures quickly defeat. Before the Cures can properly explain themselves, Kirara just straight up returns the Princess Perfume and leaves. Convinced that she is still potentially a PreCure, Haruka and Minami go to her fashion show, where Haruka gets to know about Kirara and her dreams. As Kirara goes out wearing a Dress Up Key she found, Close targets another model to create a Fashion Zetsuborg. Determined to protect her show, Kirara stands up to the Zetsuborg and gains the power to become Cure Twinkle, allowing her to defeat the Zetsuborg. After the battle, however, Kirara returns the Princess Perfume yet again, stating she is too busy to become a PreCure.

Puff and Aroma explain to Haruka, they got separated from Kanata after the Hope Kingdom was attacked by Dys Dark, led by a witch named Dyspear, entrusted with finding the three Princess PreCures who possess the Dress Up Keys. As Haruka decides to train hard to become a proper princess, student council president Minami Kaidou finds a Dress Up Key washed up on the beach. After observing Minami's graceful elegance, Haruka asks her to teach her how to do ballet so that she can become more princess-like. Despite the strictness of the lessons, Haruka continues to work hard, only to end up spraining her ankle whilst attempting an advanced move. While treating her injury, Minami confesses that she is far from perfect, only possessing her ballet skills from training hard as a kid, expressing her joy that someone asked her for lessons. Later, as Close targets a boy yearning to be a soccer star to create a Trophy Zetsuborg, Minami spots Haruka transforming into Cure Flora as she goes to fight against it. With Haruka's sprained ankle leaving her at a disadvantage, Minami's desire to protect her gives her the ability to transform into Cure Mermaid and defeat the Zetsuborg. Just as Haruka and Minami are about to celebrate their new partnership, Puff and Aroma discover that the third Princess Perfume in their possession has gone missing.