Kiryuu Michiru is a denizen of the Dark Fall and is always together with her sister Kaoru with who she guards the infiltrated Fountain of Sky. Together with Kaoru, they meet Saki Hyuuga and Mai Mishou 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.
- Technically, Michiru is Cure Bright when she has the powers of the moon, making her and Kaoru. the only ones to have Pretty Cure's power who aren't realy Pretty Cure.
- Michiru and Kaoru are the second beings of darkness who wish to leave darkness and live on Earth, first one being Kiriya.