In a quiet village, twin siblings are born: Tatara, the boy, and Sarasa, the girl. The prophet Nagi proclaims Tatara to be the destined savior who will liberate Japan from the oppressive rule of the Red King and his four sons. When the tyrannical Red King kills Tatara, Sarasa assumes her brother’s name and duties, setting out on a journey to free Japan and exact vengeance upon the Red King.