Wild Adapter (W.A.) is the new version of drugs in the manga series where Detective Kasai was assign to investigate along with his fellow detective, Araki. Wild Adapter is its official name. The ingredients remains unknown as well as the source. Once a person take it, he or she will start to act violently. People who use it daily, for some reason grow body hair, and develop fangs and claws more likely a monster/beast. The direct cause of death is stroke, heart attack or other internal organs injuries. The drug incites an extreme reactive from internal organs, leaving the body shocked like a deep-sea fish suddenly pulled to the surface.