Yonowaru

The Yonowaru is a Mushi that resides in morning glories and can infest one's nose if one chooses to smell the flower.

It synchronizes its biological clock with its host, so the host experiences the Mushi's life in one day. When the Mushi dies the host dies too, but the host is reborn the next day.

Yonowaru is the unnamed Mushi that appears in episode six that takes over Akoya and many other people in the village.

Weakness
The Mushi can be easily removed by tapping a needle on the glabella (the area between the host's eyebrows).