Tsuki no Sango

The story takes place in approximately the year 3000, when humankind arrived at the peak of its civilization, but is losing its will to keep living. It follows a girl, called "princess" by those around her, who lives on a small island with a fifty-person colony and a shining coral reef. She is a descendant of the Moon people, and the story focuses on how her ancestors supposedly came to Earth.

Pretty much sums it up, a short movie, well I would not say movie, it felt more of a picture drama or perhaps an OVA.

A small girl who talks about her grandmother of how she ... was born in the Moon and how the world ended up being deserted. The art is flawless and plays a memorable distinct sound of nostalgia, the music to describe the art of the shoring sea and starry sky was Frédéric Chopin's music. But I can't seem to remember which song it was he composed.

But anyways, you can find the movie on Youtube!