This book is actually two books in one binding: in the front, Rynna's favorite book; in the back, blank pages that serve as both a journal and a sketchbook. The binding and front book were given to her by her father before he left her, and the pages in back were later added by Rynna herself.
Rynna carries this book because she finds comfort in the pages at the beginning, and freedom in the blank pages near the end. It contains her secrets, hopes, and dreams, which makes it very valuable to her.