Magic Knight Rayearth Season 1

Three junior high school girls are brought together by fate when they hear a voice asking them to save the world. The land that calls them is named Cephiro and the voice belongs to Princess Emeraude. She stands as the Pillar whose will maintains the peace of this magical world where belief is power. But the peace in Cephiro is now threatened as Princess Emeraude is imprisoned and monsters begin to invade. With her last bit of strength, the princess summons forth the three girls who must fulfill their destiny to become the Magic Knights in the hopes of saving her world.