As part of a mixed sports tournament being held at Noble Academy, Haruka is participating in a doubles tennis tournament alongside Yuki Aihara, who she soon remembers as a student from kindergarten who used to pick on her because of her dreams of being a princess. Their relationship doesn't improve as Yuki refuses to teach Haruka, who has no tennis experience, stating he will do everything himself. Angered by this, Haruka starts taking tennis lessons from Miss Shamour, with Minami and Kirara soon helping with her training. After managing to improve considerably, Haruka comes to realise how serious Yuki takes tennis himself. On the day of the tournament, Haruka and Yuki's match is interrupted when Shut targets Yuki and creates a Tennis Zetsuborg. Understanding how hard Yuki is trying to accomplish his dream, Haruka manages to hold her own before the other Cures help her defeat the Zetsuborg. Having briefly seen Cure Flora after being rescued, Yuki has newfround respect for Haruka's dream, though is still prone to arguing with her.

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.

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