A mysterious girl who meets Saki and Mai at the Sky Tree in episode 14. She seems cold and rude. Kaoru is always with her sister, Michiru.
She gets along well with Saki's sister, Minori.
They are really part of the Dark Fall. Their duty is to guard the Fountain of Sky. They pretend to be exchange students and go to Yuunagi Junior High School in order to gather more information about Pretty Cure. Kaoru has long blue hair and blue eyes. Kaoru and Michiru sacrifice their lives to protect Saki and Mai. However, in episode 42, she and Michiru return to assist Pretty Cure in defeating Gohyaan.