Kagamigami

Kagamigami (カガミガミ, Kagamigami) is a Japanese manga series written and illustrated by Toshiaki Iwashiro.

Plot
A serial killer is on the loose and authorities are baffled! What they do not know is that this case requires non-traditional research methods. That's where Mako Miyoshi a detective extraordinary particular, and Kyosuke Kagami a Shikigami user, enter the picture. Together they investigate the supernatural crimes.