Hazuki Azuma is the main protagonist of the anime series "Yami to Boushi to Hon no Tabibito." A quiet and reserved high school girl, Hazuki is searching for her adopted sister, Hatsumi, who mysteriously disappears. Hazuki's journey takes her through various fantastical worlds within magical books, where she encounters many unique characters and challenges. Driven by her strong feelings for Hatsumi, Hazuki’s determination and emotional depth are central to the story, making her a compelling and memorable lead character.