is only the end of Sasha, the endings of the other six girls (Prim, Maxy, Charlotte, Layla, Mary and Liz) are still to come.
It could be said that now is when the deep lore part of the game begins, which has been shown little by little, as the story develops, everything shown will come together to a common point.
About Sasha I don't want to say much yet, that's a surprise ;)