Kemonogari

The "panic-in-closed-village horror" manga is set in a village named Habaki, which has a strange custom that grants the head of the village supreme authority. The story centers on Akira Sasaki, the second son of the family that leads the village. In the coming new year, Akira's older brother, the eldest son Hikaru, will undergo the ceremony that will make him the next village chief. Akira decides to use the ceremony as an opportunity to ask his childhood friend and crush Kotori Karino to leave the village with him. Meanwhile, in the mountain neighboring Habaki, two men go missing. The village remains preoccupied with preparations for the ceremony. On the day of the ceremony, Hikaru takes the mask signifying his ascent as village chief, and prepares to make his speech, when a strange creature appears.

(Source: Anime News Network)