Konoha Inoue lives out his days as a normal high schooler, hiding his dark past as a best-selling author who wrote under the guise of a 14-year-old girl. A member of the literature club, he writes improv stories that serve as snacks for third-year student Tooko Amano, the only other member of the club and a self-styled "book girl" who literally eats written words. Konoha is forced to tag along with Tooko as she seeks out strange, literature-filled cases to investigate.

One day, the book club receives a request from Chia Takeda, who asks them to help her write love letters to her crush Shuuji Kataoka. What appears to be a simple request for love advice soon turns into something more sinister when Konoha delves deeper into the matter.

Bungaku Shoujo Series got 1st place on the Kono Light Novel ga Sugoi! ranking under Best Light Novel category in 2009.

The series was published in English as Book Girl by Yen Press from July 27, 2010 to January 21, 2014.