I wonder if there is a rule engraved in their world that makes the heroines fall in love with the protagonist no matter what
hareta doesn't seem to have such a rule for him as he never felt any kind of attraction towards the heroines (or any girl for that regard), not sure if it's only possible cuz he's the protagonis (player) or they actually have the freedom to feel attraction to any character in the game (regardless if they can romance them or not)
it doesn't really help that hareta is genuinely a likeable character so it's not surprising that they fall for him, but misaki said before that if hareta keeps ignoring the heroines flags they'll end up hating him, but no matter how much hareta ignores their flags or make it clear that he's only interested in misaki, they never seem to start hating him or stop pursuing him, so makes me think they might have some freedom to how they feel towards the protagonist…