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 and Tsukasa both venture to ONL at the same time just as the order for them to stay separated is lifted. Spurred on by Midori’s encouragement, they take advantage of the lab’s facilities to take their relationship to the next level, and test the boundaries of Anzai’s self-control. Back in Tokyo, Kaname Shirase makes overtures to both Tsukasa and Lee, Nana confronts her past and reunites with ex-members of the CCC, Ishimaru digs into Queen’s past work with ReMI devils, and the former devil members of Division 5 find a new employer…