Shinigami-- literal translation, God of Death. In this case, Shinigami are beings who usually died a wrongful death, and have been given a chance to exist in both the living world and the afterlife working for the Meifu, or offices of the dead.
Tsuzuki's job as a detective is to trace the recently deceased who fail to make the transition into the afterlife. Common assignments involve vampires, ghosts, and false killings.
He is assigned a new assistant, Hisoka, a former 16-year old with powers of psychic sympathy; just as an unexplainable wave of new cases starts.
[title translation: Yami no Matsuei --> Descendants of the Darkness]<br />