Mushi are the purest creatures that exist…I think the show called them the closest things to the essence of life. We humans are very far away from the essence of life, so much so that not many people can even see Mushi. In a way all things humans view as paranormal can be explained by Mushi. Ginko is a man with one (green) eye and white hair who can see Mushi. He is a Mushi-shi that travels and aids humans who are suffering from unusual problems that are most likely caused by Mushi and this is what the entire show is about. Although the Mushi aren’t parasitic creatures by nature, they simply do what is in their nature to survive and sometimes what they need to do to survive effects humans negatively.