I'd play the girl, you'd play the guy. I'd prefer aim for scenes and chats but leaving like notes and playlists and things in journals would be super too.
High school aged. I think she'd be a junior. He can be a junior or senior.
I can see the line being a few ways. First would be she was totally popular. She had lots of friends and stuff. Cheerleaded, did all that. She started dating the football star at the end of the year. Or she could have been sorta nerdy or something but she could have had a huge crush on him. But he wasn't perfect, that's what she found out. If they were dating he could have turned abusive, or either way could have raped her. After that she wanted nothing to do with him, or his friends. Whatever happened between them made her change. She either dropped cheerleading, became even more withdrawn, just decided hate everyone, etc. And it being high school I'm sure people reacted the same way.
So junior year has started pretty rough with pushing away friends or having no friends. And seeing Johnny football in the hall every day hasnt helped.
And along comes your guy. He's new to the school and so it would be a fresh start. He can be either popular and hang out with that crowd or he could have a hard time making friends. They get paired together on some assignment and have to start talking. I think some hate and eye rolling and leave me alone looks would come from her side. Especially is some cheerleader girls hit on him.
Eventually I'm sire they'll like each other. The truth will come out to him. Maybe he beats Johnny football up. I dunno. Let's figure out everything together <3