Ai and Yu, after reading their parent's research and after their parents' disappearance, they decided to go on search for them. They ride a strange train to the Inner World in search of their parents and meets up with Lisa in the train and together they begin their journey within the Inner World.
Status: Finished Airing
Aired: Oct 2, 2001 to Mar 26, 2002
Producers: Gonzo, TV Tokyo, Dentsu, TV Tokyo Music
Duration: 24 min. per episode
Rating: PG-13 - Teens 13 or older