This mushi is completely harmless. In fact, not having it can do you harm! It's a form of natural protection unique to one area--it's name means something like 'to cultivate the earth'. Humans and other animals get the mushi inside their body by eating local plants and other foods grown or picked in the area.
As long as the person stays in the area their mushi came from, the mushi then protect them from other mushi that will make them sick, as well as giving them a certain amount of energy. A child who was weaned from its mother too soon will sometimes have developmental difficulties due to a lack of ubusuna in their system, and a person who goes away from the place their ubusuna were native to will discover they sicken and tire easily, symptoms that miraculously go away whenever they return 'home.'
Ubusuna
This mushi is completely harmless. In fact, not having it can do you harm! It's a form of natural protection unique to one area--it's name means something like 'to cultivate the earth'. Humans and other animals get the mushi inside their body by eating local plants and other foods grown or picked in the area.
As long as the person stays in the area their mushi came from, the mushi then protect them from other mushi that will make them sick, as well as giving them a certain amount of energy. A child who was weaned from its mother too soon will sometimes have developmental difficulties due to a lack of ubusuna in their system, and a person who goes away from the place their ubusuna were native to will discover they sicken and tire easily, symptoms that miraculously go away whenever they return 'home.'
A bad mushi trying to make someone sick.