Is there a prequel to After Ever Happy?

Excuse me, I'm curious about the book series "After". I've read "After Ever Happy" and I was wondering if there's a prequel to it? I'm quite invested in the story and the characters, and I'd love to know more about their backstories and how they got to where they are now. Is there a book that precedes "After Ever Happy" in the series? I'd appreciate any information you can provide.