I was thinking I need to read Heated Rivalry before watching, but maybe I will just dive in and catch up on the books later
It's so good as an adaptation that I'm glad I read the books first, but I don't think you NEED to have read the books. (It's not, like, a complicated universe with a lot of backstory. but as a Book Enjoyer I do have a pretty good idea what the secret title of episode 3 is going to be.)