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On his first day at his new school, twelve-year-old Ritsuka Aoyagi meets a mysterious twenty-year-old male named Soubi Agatsuma. Soubi claims to be a good friend of Ritsuka's brother, Seimei, who was murdered when Ritsuka was ten years old.

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.