Jinrou Shitsuji no Bussou na Nikka
人狼執事の物騒な日課
Werewolves have long been servants to vampires, but Phil seeks revenge after his father's disappearance. Disguised as a butler, he works for the renowned and dangerous vampire Eric Beaufort. Despite his efforts, Phil finds Eric to be unexpectedly warm and compassionate, and traditional methods to harm him fail. Phil struggles to carry out his mission against his new, uncooperative employer.