An adaptation of the last arc in the manga, Mushishi Zoku Shou: Suzu no Shizuku follows Ginko's peculiar journey amidst the occult to unravel the mystery behind the enigmatic girl called Kaya and the mountain that has become her home.
Ginko happens to meet a boy named Yuuta. The boy is good swimmer, but has webbed hands and cold skin. He can hardly speak the language. His mother worries about her son.