Flatcheez

Because of family troubles, Yuuta, a young boy, had to move to another city.
Changing schools and having perverted teachers might have leave him a bit confused, but thanks to the new friends he has made, he believes he can make it.
Then, one day, a friend of his older sister, Chinami, came to his house to play.
Chinami, while a bit troubling, is a quite stimulating young woman...