Tokyo, Japan, in the near future. Azami, a woman kidnapped by a mysterious human trafficking ring, is rescued by Fa’on, a werewolf. The city police discover that a yakuza alliance is involved in the trafficking, but they can’t identify the responsible family. Fa’on decides to infiltrate the yakuza and takes Azami with her. Being a regular human, Azami has no choice but to transform herself into a werewolf in order to protect herself. Thus begins the adventures of the two wolves, Azami and Fa’on.