In this world, devils and fiends would roam the streets causing havoc, while hybrids would blend in with normal humans. Devil Hunters are authorities that are responsible of disposing of dangerous devils and fiends.

Devil Hunters (デビルハンター Debiru Hantā) are individuals (human or otherwise) who have taken it upon themselves to fight against Devils whenever a threat related to them should arise in the world. They tend to use contracts with Devils to assist them in fighting.