It’s 1923, and until recently, vampires kept to the shadows. When the mysterious blood source Ascra appears, their numbers swell, leaving Japan covered in bodies. In response, the government spawns its own coven to infiltrate the dark. With S-rank vampire Defrott and the rookie Kurusu, this kill squad is made for one reason: to hunt the undead. Bloodsuckers beware; the night belongs to Code Zero!