For centuries, human-like beings known as Shokujinki have covertly coexisted with humans. Though they may seem ordinary, when they transform into feral beasts with massive claws and consume humans, they become uncontrollable. The Kifuuken dojo is a top-secret organization that is proficient in assassinating Shokujinki by amputating their arms. They are the only barrier standing between Shokujinki and their quest for absolute power. Toshihiko Momota, Kifuuken's leader's son, is smitten by a striking woman named Yuka Kamitsuki. However, their relationship is complicated because Yuka is a Shokujinki, and Toshihiko has dedicated himself to extinguishing them. As Toshihiko's brother, Kazuma, attempts to modernize the Kifuuken, it is already in the midst of a disaster of faith. The truth about the past and present is brought to light as feelings are strained. Who will survive, and who will be preyed upon by the Shokujinki?