For generations, beings known as Shokujinki have coexisted with humans, appearing identical to them except for their ability to transform into monstrous creatures with enormous claws and their compulsion to feed on people. The Kifuuken dojo, a secret organization dedicated to eradicating Shokujinki by severing their arms, stands as the sole barrier preventing these beings from taking over.
Toshihiko Momota, whose father leads the Kifuuken, finds himself deeply drawn to Yuka Kamitsuki, a woman shrouded in mystery. Unbeknownst to both, Yuka is a Shokujinki, while Toshihiko is bound by duty to end her life. Simultaneously, the Kifuuken faces internal strife as Toshihiko's brother, Kazuma, challenges the dojo's traditions and seeks to modernize its methods. As tensions escalate and hidden truths from both past and present emerge, the question remains: who will survive and who will fall prey to the Shokujinki's hunger?