Watch The Twelve Kingdoms full episodes online English Sub.
Other title: Juuni Kokuki
Synopsis: Nakajima Youko is your average somewhat timid high school student. One day, a strange man named Keiki appears before her, swearing allegiance. Before she could properly register what was happening, demon-like creatures attack Youko and her friends, after which they are pulled into a different world. A world unlike what she has ever known. Separated from Keiki, Youko and her friends must do whatever they can if they wish to survive in this new world.
Language: English Sub
Aired: Apr 9, 2002 to Aug 30, 2003
Genres: Action, Adventure, Fantasy, Magic, Supernatural
Sources: Myanimelist, Wikipedia