Neither plants nor animals can identify them. Like fungi and microorganisms, they are distinct from other types of living things. As a result, they're known as "Mushi," which is Japanese for "primitive living." Few people are aware of their existence or appearance, and even fewer know what they look like. As a "Mushi-shi," Ginko traverses the world in search of "Mushi" and information. As a result, he provides assistance to those who are experiencing issues with paranormal activity that they suspect is connected to the "Mushi".