They are neither plants nor animals. They differ from other forms of life such as micro-organisms and fungi. Instead they resemble the primeval body of life and are generally known as Mushi. Their existence and appearance are mostly unknown and only a limited number of humans are aware of them. Ginko one of these select few, a Mushi-shi, travels around to investigate the Mushi. In the process, he also lends a helping hand to people who face problems with supernatural occurrences that may be related to the Mushi.

[Source: AnimeNfo]

The mushi are said to become uneasy during an eclipse. Tanyu sends Ginko to monitor a village for the appearance of a mushi that causes a neverending eclipse. Her foreboding is justified when the village is enveloped in darkness...

Adaptation of the "Odoro no Michi" (Path of Thorns) manga chapters.

[Source: MyAnimeList]

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.

[Source: IMDb]