PreCure is the name of a group of magical girls, often linked through the magical realms and assisted by some manner of "Fairy" (magical lifeforms). There are numerous examples of them across several worlds in the multiverse.
Pretty Cure Max Heart
Nagisa Misumi and Honoka Yukishiro are two middle school students who meet a group of fairies from the Garden of Light. Together as Cure Black and Cure White, the two girls worked together to defeat the evil Dusk Zone. Later, they would be joined by Hikari, an embodiment of the Queen of the Garden of Light. They were the first of the Pretty Cures, though there have been rumors of earlier teams which were active. They are still active within Tokyo, though not as much as they used to be.
Pretty Cure Splash Star
Saki Hyuuga and Mai Mishou, having met once when they were young children, find themselves reacquainted when a pair of fairies ask for their assistance in protecting the Fountain of the Sun from evil forces bent on its destruction. As Cure Bloom and Cure Egret, the two fight together as Splash Star, defending their home town of Yuunagi from all evil.
A group of girls at a private school discover their local librarian is more then meets the eye; they are soon transformed into a five member magical girl team. The first PreCures to count at more then two, PreCure 5 has defeated several enemies who have tried to destroy the magical kingdoms beyond Earth.
Love Momomzono is a middle school student living in Clover Town who dreams of being a dancer. When the evil forces of Labyrinth seek to destroy the Multiverse, Love and her friends become the team known as Fresh PreCure. This is the first PreCure team who managed to allow an enemy to become one of their group. It is also rumored that they may know something of the unusual universal changes which have occurred...