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FINAL FANTASY: UNLIMITED

Action, Adventure, Fantasy, Sci-Fi

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) — Description from AniList community (anilist.co).