The Petite of Mayohiga (Update Windows ENG)

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 boys to play with these strange girls, but something seems amiss about them…