spoilers ahead!

without spoiling too much, all you have to know right now is that - nobara and maki essentially save the day. - nobara learns rct - yuki actually has a prominent role in the story, and becomes nobamaki's cool aunt - geto is freed from kenjaku (now dead) and is gallavanting around the world with yuki. - gojo becomes principal the only key differences i've made is that - nobara & maki are both explicitly lesbians - they didnt quit sorcery immediately, but rather stalled it, - and that itafushi havent gotten together (yet)