Raizen (雷禅) is one of the three kings of the Makai (in fact, he was considered the strongest of the three) and Yusuke's ancestor. 700 years before Yusuke is born, Raizen, looking for a human to eat, comes upon a human woman. She reveals herself to be a "cannibal shaman", a human who eats the flesh of the deceased to create antibodies to the disease within their blood, and that if he consumed her he would be killed. Raizen falls in love with her and conceives a child. He leaves her,and promises to never eat human flesh until he sees her again. However, she dies before he returns, and since he never saw her again, he stayed true to his word and never ate human flesh again. Raizen summons Yusuke to the Makai Realm as he is on the brink of death from starvation and requires someone to take his throne. In the anime television series, Raizen is voiced by Takayuki Sugō in Japanese and Christopher Sabat in English.