Shinkyoku Soukai Polyphonica Eternal White

Each title is written in the format Shinkyoku Polyphonica *title* White (神曲奏界ポリフォニカ *title*・ホワイト). 1. Eternal 2. Infinity 3. Missing 4. Anniversary 5. Ancient 6. Spiral 7. Marginal 8. Memories 9. Pure Vol. 1-4 were illustrated by Kinako Hiro (きなこひろ) Vol. 5-9 were illustrated by Nagi Kasumi (凪 かすみ)

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)

Polyphonica "the Black" is finally made available as a "hard-boiled" detective comic. In this city the police have joined forces with spirits to investigate crimes, resulting in the formation of a specalist unit - the "Spirits of the Dead" or "Ghost" Division. A murder occured in a quiet residential area, and the victim's daughter vanished from the scene leaving only mystery in her wake. The victim's contracted spirit was "Leon"... but is he really a criminal?