Mushi represent the most fundamental forms of life in the world. They exist without any goals or purposes other than simply "being." They transcend the constraints of the words "good" and "evil." Mushi can take countless forms and are capable of mimicking elements of the natural world, such as plants, diseases, and even phenomena like rainbows. However, this is merely a vague definition of these entities that inhabit the vibrant world of Mushishi, as even calling them a form of life would be an oversimplification. Detailed information on Mushi is scarce because most humans are unaware of their existence. So what are Mushi, and why do they exist? This is the question that Ginko, a Mushishi, constantly ponders. Mushishi are those who research Mushi in hopes of understanding their place in the world's hierarchy of life. Ginko pursues rumors of occurrences that could be linked to Mushi, all in the quest for an answer. After all, it could lead to the meaning of life itself.