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Aria the OVA ~Arietta~

The story takes place in the year 2301 and Mars became a planet which mankind has tranformed into a place where they can life. Now the planet is known as the planet “Aqua” because most of the planet is covered in water. One day a 15 year old girl Misunashi Akari comes to the planet Aqua to become a Undine. This is where the story begins and we get to see what strange, funny, sad and mysterious events she meets. First ever OVA release from anime series "ARIA" featuring the yet untold story about the Aria company before the arrival of Akari. (Source: AniDB) 9/10