MAGIC KNIGHT RAYEARTH
Hikaru Shidou, Umi Ryuuzaki, Fuu Hououji are on a field trip to the Tokyo Tower with their respective schools. The girls are blinded by a flash of light and hear a voice calling for the Legendary Magic Knights to save Cephiro. They fall through the sky into another world, Cephiro. Once there, they meet Master Mage Clef. Clef explains, "[In Cephiro], one's will has the ability to change reality for better or worse. The dark fears in people's hearts become monsters, while a well-intended wish can do miracles. One person, the Pillar, whose will is stronger than anyone else's, is responsible for maintaining through her prayers the well-being of Cephiro."
In the first story arc, the current Pillar, Princess Emeraude, has been captured by her high priest, Zagato. The three girls are charged with the task of saving the Princess by activating the three Rune-Gods. They are given a bizarre creature named Mokona to guide them on their journey. When the girls finally reach Emeraude, they learn that she had fallen in love with Zagato, hindering her ability to pray solely for Cephiro's well-being, and had summoned the Magic Knights to kill her since no one on Cephiro could harm the Pillar.
The second story arc deals with the complications caused by the first season's climax: three warring planets, Autozam, Fahren, and Chizeta, have begun their attempts to conquer Cephiro and a new Pillar must be chosen before the whole planet is destroyed. Hikaru, Umi, and Fuu are once again summoned to Cephiro. In the manga it is later discovered that the mysterious Mokona is responsible for their being summoned back to Cephiro, and he is, in fact, the creator of both the Earth and Cephiro. In the anime they return to Cephiro because of their (especially Hikaru's) strong desire to do so.
Eventually, Hikaru is chosen to become the new Pillar. However, she rebels against the Pillar system, deciding that the fate of the planet should not be the responsibility of only one person, effectively preventing that person from ever being able to live and love freely.
Hikaru, Fuu and Umi return to earth, but still can visit their loved ones in Cephiro.