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 grapples with Lee's bombshell that drinking human blood can have regenerative, strengthening powers on devil bodies and Lee offers to share what he knows if Anzai's comrades hide him away. Meanwhile, Zero Seven, the sniper, faces the consequences of her rebellion as Zero Two works to tie up loose ends from the Ikebukuro incident, and reveals that he has an old connection to Anzai..."

Tsukasa insists on seeing that Oryo is cared for at a hospital, defyingAnzai's wish that she stay hidden at their safe house. Before she can even make it inside the hospital, Tsukasa is taken hostage by a desperate Zero Seven, who eventually makes a surprisingly humane choice when facing off with her old comrades. Tsukasa and Anzai decide to take the next step in their relationship, and the old doctor from ONLO reveals why he's in town..."

Dr. Kano sets up a -chance meeting- between the unsuspecting Anzai and his mother. Lee visits a blood donor as we catch a glimpse into his past at ONLO. Anzai's breach of the stand-down order has repercussions for F Squad, which gets a new leader, Ishimaru, who makes a surprising suggestion on how to handle the rogue Seven and Nine...

Ishimaru tries to bring in Zero Seven and Nine to get inside info on the CCC. In exchange for her cooperation, Zero Seven asks for information on the devil that murdered her mother, and the fateful meeting between Seven and Kikuhara is revealed. The house of an activist for devil rights is set on fire, and at the scene, Kikuhara pushes Anzai to remember his past...

Ishimaru, still shrouded in suspicion, leads F Squad on a raid of the CCC's hideout to get ahold of the list of members, but the CCC turns out to be several steps ahead in this cat-and-mouse game. When Anzai gets caught in the crossfire, Tsukasa has to make a life-or-death decision...

Anzai, thanks to his reawakened memories from his childhood, is called in to the MPD to give a statement on Kikuhara. After the dissolution of F Squad, Jill struggles with a sense of being unmoored. Lee has gained a reputation as a bit of a devil-hero, but shadowy figures from his past start to catch up to him. And deep in the forest somewhere in Gunma Prefecture, Makimura opens his eyes...