"Bungaku Shōjo Memoir I - Yume-Miru Shōjo no Prelude" is a prequel to the "Bungaku Shōjo" series, exploring the origins of the central characters and their relationships. The story centers on Touko Amano, a high school girl who harbors a secret: she consumes literature, literally eating pages from books. This peculiar habit stems from her deep connection to stories and her desire to internalize their essence. Touko is a member of the school's literary club, where she meets Konoha Inoue, a reserved and introspective boy who becomes her confidant and assistant.

Konoha, a former aspiring novelist, has abandoned writing due to a traumatic experience involving his first published work. Despite his reluctance, he is drawn into Touko's world, where he assists her in fulfilling her role as the "literary girl," a figure who helps others by crafting stories that reflect their innermost struggles. The narrative delves into the emotional and psychological complexities of the characters, particularly Touko's enigmatic nature and Konoha's internal conflict.

The plot unfolds through a series of vignettes, each focusing on different individuals who seek Touko's help. These stories often intertwine with Konoha's past, revealing his struggles with guilt, identity, and the pressure of expectations. As the narrative progresses, the bond between Touko and Konoha deepens, highlighting themes of healing, self-discovery, and the transformative power of literature. The prequel sets the stage for the main series by establishing the dynamics between the characters and the emotional groundwork for their future interactions.