Oh, so something like... They both grew up in the same crappy group home, but Adora is a "delinquent" because she gets into fights with bullies and stands up to asshole teachers, while Catra is a grade-A honour student who's a total bitch to everyone because she's secretly afraid that people will judge her - or worse, PITY her - if they find out she comes from an institution. They promise to run against each other for student body president in the spirit of friendly rivalry, but after Catra runs herself ragged campaigning for votes, Adora gets disqualified from the race and suspended from school after she gets caught breaking curfew to distribute food to the homeless with Glimmer, her new foster sister. Catra holds a grudge about this for ages, constantly bickering and flirt-fighting with Adora at every opportunity, until Adora eventually breaks her free from the clutches of the cruel but well-connected principal, and through the restorative, affirming process of being gay and doing crimes, they finally get together.