Since I don't have direct access to the book's content beyond the publisher's description, I'll have to make educated guesses. Perhaps "Book Worm Top" is a metaphor or a symbol in the story. Maybe the main character is characterized as a bookworm, and the "Top" part could be a typo for "topic" or a specific role she plays. Alternatively, it might be a term used within the story that represents her personality or a pivotal moment.