I looked up the guide for the game to try to get all the bad endings at once, but I cannot figure out how to get Sarah's bad ending on day 4. It says that Sarah and/or Kira need to have less than 5 points, but I cannot figure out how to get passed day 1 without Sarah already being at 5, and it's an insta-game over if you don't have 5 points with Kira on day 3.