On Earth, more and more people began to mutate into beasts - terrible and inhuman monsters. Some also turn into Devils (men) and the devil (women). They retain the ability to return to human form,and as they left the human mind and soul. Mutation is possible only if a person has the gene Orchids. Such a fate befell Fudo Jun - Centerfolds. It turned into a devil, and it were forced to kill other creatures.