Haruka Haruno, a young girl who wishes to be a princess, meets a strange boy named Kanata who encourages her dream and gives her a special charm. Several years later, Haruka enrols at the prestigious Noble Academy boarding school, where her new roommate, Yui Nanase, shows her around the campus. Whilst hiding in the woods over her embarrassment over revealing her dream, Haruka comes across Puff and Aroma, two fairy siblings from the Hope Kingdom. Just then, they are approached by Close, an emissary from the evil DysDark organization, who traps Yui's dream of becoming an author in a Gate of Desperation to create a monster known as a Zetsuborg. As Haruka becomes determined to protect Yui's dream, her charm turns into a Dress Up Key, which Haruka uses with the Princess Perfume the fairies brought with them to become the Princess Pretty Cure, Cure Flora. Using her new powers, Haruka manages to defeat the Zetsuborg and rescue Yui. Afterwards, Puff and Aroma reveal they were sent in search of the Princess Precure by Kanata, who is revealed to the Prince of the Hope Kingdom.

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.