The screen remains black after showing "launch the story by clicking "start story" at the top", cuz the UI "start story" doesn't show up.
Also tried to click "test fade in" in Overlay in the "storyline" atom, cannot solve the issue as well.
This method doesn't work in your "Girlfriend Shirou EP2" scene, when i click "test fade in" in Overlay in the "storyline" atom, it's still black. Remove the Overlay still doesn't work.