Bungaku Shoujo follows the story of Konoha Inoue, a high school student and former novelist, who gets drawn into the quirky world of Tohko Amano, a peculiar girl with a deep love for literature and a strange habit of eating books. Together, they experience various literary adventures, blending reality with the fantastical, as they unravel the mysteries hidden within the pages of books and the secrets of their own pasts.