All of the heroines are. How much they remember at specific points is questionable, but by the end of each route every heroine remembers the secret of the world. I imagine their memories were tampered with to keep the validity of the routes in check. Nobody had to tell them about it. They already knew.
Don’t listen to this “previous loops” fanfic.
There are more than 7 outcomes in the VN, so we already know there are more loops.
