hoohttp://www.dlsite.com/books/work/=/product_id/BJ01174912.html
As always, please support the artist and buy his works.

The siren that signals the start of sex will sound in the village again today.

The sirens in the village signal the start of sex! The lust of the villagers, who have lost all sense of reason due to a lewd custom, strikes...!
Sorako, a female teacher, is assigned to a school in Danne Village to search for her missing sister.
The village is peaceful and the students are all good kids.
However, on the day the festival was to be held, she heard a siren saying, "It's ritual time. Please get together with the men and women nearby."
The boys immediately push Sorako down and fondle her.
The boys' young lust is unrelentingly pummeled, and her wet pussy becomes hotter and hotter... Will she be able to find her sister without drowning in this pleasure...?