"Book Girl" is a manga series adapted from the light novel series of the same name, written by Mizuki Nomura and illustrated by Miho Takeoka. The story centers around Konoha Inoue, a high school student and former best-selling author, who becomes entangled in the literary club's activities under the guidance of Tohko Amano, the club's president. Tohko, who has a peculiar habit of eating books, enlists Konoha's help in writing short stories for her to consume. This unusual dynamic forms the core of their relationship and drives much of the narrative.

The series is structured around episodic mysteries, each tied to a classic literary work. Tohko and Konoha often find themselves drawn into the personal struggles of their classmates, which mirror themes from the referenced literature. These mysteries explore themes of love, loss, betrayal, and identity, often delving into the darker aspects of human emotions and relationships. Konoha, who harbors a painful secret about his past as an author, gradually confronts his own trauma through these encounters, while Tohko serves as both a catalyst and a source of support.

Key characters include Tohko Amano, whose cheerful and eccentric demeanor masks a deep loneliness and a mysterious connection to literature; Konoha Inoue, whose reserved and troubled personality stems from his guilt and regret over his past; and other classmates whose personal stories intertwine with the literary themes explored in each arc. The series balances its episodic structure with an overarching narrative that delves into Tohko's true nature and the unresolved tension between her and Konoha.

The manga adaptation retains the literary focus of the light novels, incorporating quotes and references from classic works to enhance the thematic depth of each story. The interplay between the characters' personal struggles and the literary motifs creates a layered narrative that appeals to fans of both mystery and drama. The series concludes with a resolution to the central mysteries surrounding Tohko and Konoha, tying together the emotional and literary threads that run throughout the story.