Mushishi 3

They live on the shadowy border between the possible and the impossibleancient lifeforms known as mushi. Rare is the individual who can see them, but those with that special ability, the mushishi, can counter the creatures' deadly effects on humans. After a young boy is orphaned in the forest, he is saved by a reclusive female mushishi. But the lake near the mushishi's home holds a deadly secret, and the boy must find out what it is before his only friend is lost forever.