This isn't tagged as a harem game so I am a little more cautious at first, because in non-harem games usually only trouble follows if you start dating everyone immediately.
But more specifically with Bella, her uniform prank gave her negative RP with me (being a protective brother myself) and she never got it above zero by the time I had to choose things about her. Well, that and people who are willing to prank a complete stranger like that probably also treat service workers poorly and generally are trash. So she has a huge deficit to make up for and just doesn't.