Hyla The Sprocket - The babas of Mayohiga Ver.22.01.06 Final Win/Android (eng) - Adult Sex Game

Machine translate

The protagonist has come to stay with his grandparents in the countryside, as he does every year.
However, he has no one to play with, so he wanders off deep into a forest by himself,
before stumbling upon a place known as Mayohiga.
There, he finds a tiny little shrine, and 3 strange girls who speak rather old dialects.
It's apparently customary for guys to play with these strange girls, but something seems amiss about them...