The story takes place in approximately the year 3000, when humankind arrived at the peak of its civilization, but is losing it's will to keep living. It follows a girl, called "princess" by those around her, living on a small island with a fifty person colony and a shinning coral reef. She is descendant of Moon people, and it focuses upon how her ancestor supposedly came to Earth.
— Description from AniList community (anilist.co).
