Everything is natural in the world - going down the species ladder from the most complex human organism to the simplest, a logical question arises: "What then?" What is the starting point? The starting point of life? Musi. Creatures surrounded by a darkness of ignorance, invisible to most people, causing both joy and sorrow, affect nature and people. Musi is both life itself, which flows into our world, and death, which comes from them. Mushi masters are the people who study them. Following their path, they gather new information about musi, helping people who are faced with these mysterious life forms. Ginko - young, but already a gray-haired musi master, who, traveling, is looking for an answer to the most important question of his life.