Every 3,000 years the human world is united with the demon world and the man-beast world by the revival of the Super God, known as the Overfiend. The saga follows Jyaku Amano—a man-beast—and his quest to find the Chōjin and to ensure the safe future of all three worlds. However, he finds his beliefs put to the test when he encounters numerous demons, who plan to destroy the Chōjin and prevent the three worlds from joining.