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The story takes place in Eternia, a world where two planets, Inferia and Celestia, face one another, separated by the Orbus Barrier. It all begins when two of the main characters, Reid (or Rid) Herschel and Farah Oersted, notice an strange change in the color of the Orbus Barrier and some kind of spaceship falling down from Celestia. When they go to see what happened, they meet a cute girl, Meredy, and her pet, Kuweeky or Quickie, who is dressed in a strange fashion and speaks a strange, foreign language.

Thus, Reid and Farah decide to go see their childhood friend, Keele (or Keel) Zeibel, in search of answers. There they learn Meredy speaks Melnics, an ancient civilization's language. So, when they finally understand her words with the help of a special earring, she says she comes from Celestia because the two planets are going to collide and collapse in the Grand Fall. They must search for the Greater Craymels to stop the fall and save both worlds.

At the start of their journey, they can't really believe what Meredy says, as in Inferia, after thousands of years of isolation, Celestians are said to be man-eating ugly monsters. Eventually, as they travel through all of Eternia requesting the help of the Greater Craymels and meeting new friends, such as Ras (Race), Max (Fog) and Chat, they'll finally uncover the secrets of Eternia and how to stop the Grand Fall.