Nandanox her the solution:Yep, i have the exact same issue.
tried playing both with and without walkthrough mod, and i get stuck at that point myself at the end of v7*
One of the options is said to reduce the "intruder" flag, but it doesn't change.
i even tried manually setting the flag to 0 in my save, and after waking up i did a quick save to check and "intruder" flag was back to 3 after i selected "Wake Up" in the morning.
Not sure how you got into that state, but you won't be able to get out just by playing. You're missing event a7_29, which you can only get before Liza comes to stay (don't worry, you didn't miss much, just a short conversation about Liza at dinner). At this point the only escape is to manually mark the event as complete by using the developer's console. Load the save and (while the Day black screen is still visible) press SHIFT-O, and the developer's console should display. Then enter
events += 1
exit
This will mark the event as complete, and you'll be able to start the next game level immediately.