Magic Knight Rayearth (1994)

Season 1: Episode 1

Durning a field trip at the Tokyo Tower, three girls from three different schools, are transported to a medieval like land named Cephiro. The girls introduces themselves, Hikaru, Umi and Fuu, who are all in the 8th grade, reguardless how they look. They are greeted by a wizard named Clef. Clef explains that their high ruler, Princess Emeraude was imprisoned by one of her guards name Zagat, high above the skies of Cephiro. He then explains that Princess Emeraude made it clear about the Legendary Magic Knights, who are destined to save their world.