Murder Mystery of the Dead

In the year 20XX, civilization has collapsed due to the spread of a zombie virus. A man in a lab coat appears in a community of survivors and announces, "We've found an antibody. This can stop the zombification!" But shortly after, he is murdered by an unknown assailant.

Across the land, attacks by "zombie worshippers" are on the rise. Rumors of a mysterious strangler spread. Survivors are disappearing one by one, and each night, a mysterious song echoes from the depths of the underground...