Rasetsu (羅刹) is the younger brother of Yasha-o. He was the son of the previous Yasha-o and his wife (who died when Rasetsu was very young and appears in the flashbacks of Yama's mother) while Yama (current Yasha-o) was the son of the previous Yasha-o and another woman who was not married to him. Despite all this, Rasetsu seeks for his older brother's love and attention. He greatly idolizes Yama for his skills and power. When it is time to choose the new Yasha-o, Yama volunteers Rasetsu for the title, thinking that only the legitimate son should have the title. Later that night, Rasetsu took on a journey and leave the throne to Yama. Yama's mother was the first one to get pregnant despite that she's not the real wife of the previous Yasha-o. but despite all of this, the mother of Yama and the mother of Rasetsu get along very well that when Yama's mother was pregnant with him, Rasetsu's mother was the one who took great care for her. He died while trying to block the way of Koumokuten; Koumukuten killed him. He is the husband of Shara.