the one girl who never seemed to show much romantic interest in the main character was Yotsuba. However, it is revealed near the end that she had been in love with Fuutarou, the MC, since the beginning as she had met him 5 years ago and other bullshit. In the end, he ends up choosing her because he's a stupid shit who clings to that past encounter instead of choosing based on the event of the present, which I've always though was stupid.