There's a gamebreaking bug in this version of the game, fortunately it's only present in the first week on a fresh save.

TO AVOID THIS BUG, DON'T GO TO THE BOOKSTORE DURING THE FIRST WEEK OF THE GAME.

During the first week the player is usually locked into the tutorial, being forced to go to school everyday. However, if you go to the Bookstore's adult section, it will pass the time and skip one day of school. That will lock the game on the Saturday, since you haven't met all the girls at that point.

This bug will be fixed in the next version!