Yamibo - Darkness, the Hat, and the Travelers of the Books (2003)
Hatsuki, a high school girl infatuated with her sister Hatsumi, faces a shocking turn of events on Hatsumi's 16th birthday when a mysterious green light engulfs her, whisking her away. Determined to find her sister, Hatsuki is aided by a quirky, chick-like creature and ventures into "The Great Library," a magical realm containing countless worlds within books. As she journeys through these literary landscapes, Hatsuki embarks on an adventurous quest to track down Hatsumi, navigating both familiar and fantastical stories along the way in her pursuit of love.
