A thick mist covers the city of Faith-Delhi constantly. In the mist and smoke of this metropolis, demons known as "Pagans" lurk in the shadows. Pagans are born when humans fail to join the other souls in the path to reincarnation. There is a group known as the "Twanbach Funeral Service Company" who specializes in hunting these Pagans. Reginald, a 100+ year old vampire that looks like he's 20 years old, gets hired by the Twanbach company by the mysterious twins, Vanessa and Veronica Twanbach.

(Source: MangaHelpers)

In a place called Polyphonica, humans and spirits live side by side. Young musicians create magical sounds with their music, which binds the spirits to them. A struggling student named Phoron accidentally summons a spirit he met in childhood but later forgot about. Phoron could use all the help he can get, but this feisty spirit may prove to be more than he can handle!
(Source: CMX)