Kiryuu Kaoru

Kiryuu Kaoru is a denizen of the Dark Fall and is always together with her sister Michiru with who she guards the infiltrated Fountain of Sky. Together with Kaoru, they meet Hyuuga Saki and Mishou Mai at The Sky Tree and in an attempt to infiltrate Pretty Cure, attend Yuunagi Junior High as exchange students. She and her sister eventually end up befriending both Saki and Mai and later assists Pretty Cure in taking down the Dark Fall.

History
Kaoru, along with Michiru, was created by Akudaikan to guard the Fountain of Sky from being resurrected. While there, they sometimes expressed feelings of loneliness, taking comfort in each other. One day, they saw two fairies in trouble and saved them, though did not give it much thought afterward.

They later transfer to Pretty Cure's junior high school to spy on them and find their weaknesses. However, they end up softening to the enviroment, and when it is time for them to fight each other, they instead decide to work together. As they confront Akudaikan and Gohyan, Kaoru and Michiru decide to sacrifice their own lives to save Saki and Mai. As they disappear, they are erased from everyone's memories, except for Saki and Mai's.

After the Dark Fall manages to steal the Fairy Carafe, and resurrect all the defeated denizens, Michiru and Kaoru join together with Saki and Mai against the Dark Fall. The two sisters decide to go confront Akudaikan, without Pretty Cure, but they follow them anyways. During the last battle, the Sky Tree grants Moop, Foop, Flappy, and Choppy new power, enabling Saki and Mai to again become Cure Bloom and Cure Egret, and Michiru and Kaoru gain the powers of the Moon and Wind respectively. They defeat Gohyan together with Spiral Heart Splash Star.

Power of the Wind
During the last battle, Kaoru is given the power of the Wind (Cure Windy), as Mishou Mai reverts to Cure Egret. In this form, Kaoru performs Spiral Heart Splash Star with Cure Bloom, Cure Egret, and her sister, Kiryuu Michiru, who acquires the power of the moon.