Basara Series by Yumi Tamura

Series Description: In the future, an apocalypse all but destroys the world, making Japan a pretechnological desert wasteland where fierce kings use murder and destruction to keep the terrified peasantry in line. When Tatara, the prophesied "Child of Destiny, " is murdered, his twin sister Sarasa must face the Red King -- and the possibility of yet another apocalypse! The Red King ruthlessly murders Tatara before the horrified eyes of the town... moreSeries Description: In the future, an apocalypse all but destroys the world, making Japan a pretechnological desert wasteland where fierce kings use murder and destruction to keep the terrified peasantry in line. When Tatara, the prophesied "Child of Destiny, " is murdered, his twin sister Sarasa must face the Red King -- and the possibility of yet another apocalypse! The Red King ruthlessly murders Tatara before the horrified eyes of the town. Now it's up to Sarasa to keep everyone from being slaughtered as well. How? By pretending to be her brother and leading the people of her village to safer ground. But how long can she keep up the pretense of being savior of the world? less