An Untainted Girl's Dirty Adventure - Version 1.0 by StudioTsunnequze - Adult Sex Game

The species known as Homo Sapiens died out.
However, this was not the end of humanity, but a new beginning.
On an Earth that was just a shadow of its former self, humanity had adapted to its environment, building a new and controlled world.
The main character of this story is a single girl who has never even seen the opposite sex...