Shirasunamura

Shirasunamura is a shounen manga written and illustrated by IMAI Kami.

Plot
Oogami is a detective by day and exorcist by night, solving cases and hunting spirits together with his ghostly assistant Kazari. One day, a mysterious package with horrifying contents arrives in Oogami's mail, the only clue to its sender being the name of a remote village: Shirasunamura.