THEY HAVE EXISTED SINCE THE DAWN OF TIME. Some live in the deep darkness behind your eyelids. Some eat silence. Some thoughtlessly kill. Some simply drive men mad. Shortly after life emerged from the primordial ooze, these deadly creatures, musi, came into terrifying being. And they still exist and wreak havoc in the world today. Ginko, a young man with a sardonic smile, has the knowledge and skill to save those plagued by mushi . . . perhaps.