Wicked City Novel Volume 01 (Mature)

"(W) Hideyuki Kikuchi Another world exists beyond the one humans can see, a world populated by demons. A tenuous peace treaty is the only barrier between the worlds, the only thing protecting humanity from destruction. A secret police force protects the boundary between the dark world and ours. Two Dark Guard agents, one demon, one human, form an unlikely partnership to stop an assassination and avert an all-out war. But to save both worlds, they risk not only their lives but their souls!"