Check the Night Fox Works Patreon. Even when following for free, you can still get updates on their games.
Edit: I'm following for free over there for the updates, and to be able to upgrade membership when I have the cash to spare.
Exercise(Increase Strength) and read(Increase Intelligence) until you can't do it anymore. You will then unlock the gym and library, though you may or may not need to be in the right place at the right time of day. I've only played the game once, so I'm not intimately familiar with what specifically needs to happen, but I do know enough to point you in the right direction. Hope this helps!
I am currently stuck, with the highest being at 50%, and one girl completely absent. As of 2:13pm Pacific time on January 2nd. I cannot seem to find a way to proceed from this point. If that is where the most recent public update ended, then nevermind. But if not, some assistance would be much appreciated. If I figure out a solution on my own, I will edit this comment.
Edit: I believe I have figured out a solution.