Based on Gô Nagai's manga, about mild-mannered teenager Akira Fudô, who merges with a demon to fight other demons.Based on Gô Nagai's manga, about mild-mannered teenager Akira Fudô, who merges with a demon to fight other demons.Based on Gô Nagai's manga, about mild-mannered teenager Akira Fudô, who merges with a demon to fight other demons.