Yu: The Secret of Gaudium
Jane arrives in a desert area. Ai accidentally pulls a Cactuar out of Poshipocket and they try to capture it. It proves too fast and dangerous with its needles for capture however. They chase it into the desert and find a whole mess of Cactuar. Fungo translates that their world was destroyed by an immense force and that they are stuck here. Soon, a giant tidal wave comes to destroy them all. Cid tries his machines to stop it, but it fails. Lisa uses her Kigen Summon to stop it, but it fails. Even, Kaze summons Bismark, but he cannot stop it. Eventually, the Cactuars join together to create a vortex that disperses the tidal wave. They appear unharmed and Jane heads out once again.
Aired 19/02/2002EP 20 - Yu: The Secret of Gaudium
Final Fantasy: Unlimited
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.
(Source: Anime News Network)