In the beginning of the 21st Century, our highly developed civilization was destroyed, leaving the people of Japan suffering under the rule of tyranny. After several hundred years a set of fraternal twins were born in the villiage of San-in. The boy was named Tatara and the girl Sarasa. On the day of their birth, the prophet Nagi fortold to the villiagers: "This child is the destined one who will lead the country to freedom when grown."
The people of the villiage believe the destined one to be Tatara. But is he really the one?