JFC, misable content in games is such a downer, and this game appears to have a lot. If you don't do something by x day or something available only during x leads to missing the trigger for getting x harem, etc.
I get it with crucial plot-related story points like whether to get rid of some guy giving you trouble leads to missing scenes which only happen if he's around, or whether you break up some girl's engagement to have her for yourself or not - but everything else should be obtainable through repeatable events.
Does anyone have a short guide on which characters and harems are mutually exclusive / impossible at once so I know which ones to pick in one save and which others in a 2nd one? The game is a bit shit and timewasty otherwise if you're aiming for something and realize too late you've screwed things up.