A Departure and New Ties
Hikaru, Umi, and Fuu have been reunited with their families, but their hearts are still not at ease. The three promise to meet each other at Tokyo Tower, the place where they first met. Suddenly, with another mysterious flash of light, the three girls are whisked back to Cephiro, where Mokona and Clef await them. Source: crunchyroll
Aired 10/04/1995EP 21 - A Departure and New Ties

Magic Knight Rayearth II
Soon after Hikaru, Umi, and Fuu return to Tokyo, the three of them meet at Tokyo Tower to talk. Hikaru says that she wishes they could return to Cephiro and do something good for the land that Princess Emeraude protected so dearly. Umi and Fuu agree. Suddenly, a light appears in the sky and they are transported to Cephiro. Clef explains to them that with no Pillar to keep Cephiro peaceful, it has fallen into chaos. Monsters are multiplying and the land is becoming desolate. All the remaining inhabitants of Cephiro have moved into a magical castle. Clef also tells the girls some alarming news; three other countries, Chizeta, Fahren, and Autozam are trying to invade Cephiro and take over the Pillar system for their own purposes. The girls must stop the invaders as well as the mysterious and evil Lady Debonair, who believes she is the rightful Pillar, all the while desperately hoping and searching for a new Pillar to make Cephiro into the beautiful land it once was.
(Source: Anime News Network)