In a world plunged into terror by Xenos—man-eating demons of the night, Kazuki Kayne’s life is torn apart when his family is slaughtered and devoured by a Xeno unlike any other. With his blind twin sister Kaya as his only surviving kin, Kazuki vows vengeance leading the siblings to join the Xeno Hunters, a secret order of Samurai Mages sworn to eradicate the Xenos. As they venture into the blood-soaked lands ruled by these creatures, the twins uncover a shocking truth linking the Xenos to a forgotten god and a massacre 15 years ago that supposedly claimed the life of their elder brother. Twisted by secrets and consumed by betrayal, Kaya turns against Kazuki, siding with the creatures they once swore to destroy. Siblings once bound by blood, now fight to the death as sworn enemies in the ultimate war of survival to uncover the truth behind the world's approaching descent into chaos, were only one side will emerge from the carnage.