In a quiet village, twins are born: a boy named Tatara and a girl named Sarasa. The prophet Nagi prophesies that Tatara is the one destined to overthrow the oppressive rule of the King and his four sons. However, when the merciless Red King kills Tatara, Sarasa is forced to assume her brother's identity and take on his mission. With a burning desire for vengeance, she sets out to liberate Japan and bring down the Red King.