Personally I’m really obsessed with the lore in Fire Emblem: Three Houses
I only realized after I finished the series and reflected on it, that one of the reasons I enjoyed The Expanse so much because I was enjoying the complex and intricate politics between sensible actors with different motivations. It helped me cope with the real world’s politics being full of sadistic fools.
I haven’t seen the TV show so I don’t know where it leaves off, but if you haven’t read the books, the last 2 books into the ending was a hell of a crazy ride. And it wraps up with a conclusion that I didn’t foresee as possible. I highly recommend the books.