"Mushi" are the most basic and enigmatic entities in the world. They have no discernible objectives and their existence defies notions of morality. Their appearances are diverse, and they can imitate natural phenomena like illnesses, plants, and rainbows. However, calling them living beings would be overly simplistic due to the dearth of information available on them. Human ignorance regarding their existence makes studying them difficult. This lack of knowledge prompts the question of what these "Mushi" truly are and their raison d'être. The quest for answers is a constant preoccupation for "Mushishi" like Ginko. These individuals dedicate their time to investigate Mushi and understand their role in the hierarchy of the universe. Ginko, in particular, relentlessly chases after rumors relating to Mushi to uncover their truth. Ultimately, answering this question may lead to the revelation of the meaning of life.