Tsukasa, a college student, is rescued from an attack by a devil, one of many vampires that can blend in among the human population. Anzai, her savior, is a half-devil who exploits his supernatural gifts as a member of a shadowy police task force that specializes in devil-related crime in Tokyo. As Anzai continues to keep guard over Tsukasa, the two quickly forge a tentative bond—one that Anzai fears will test his iron-clad rule of never drinking human blood…
Anzai wakes up to find himself in the devil treatment floor of a hospital. While Anzai was unconscious he dreamt of his childhood at ONLO, and may have recalled a blocked memory involving both a young Kikuhara and his real father. As a result of the incident on the roof, the brass at the MPD have insisted that Tsukasa and Anzai be temporarily separated. Back full-time at school, Tsukasa makes an important discovery that will affect her future…