A fan disc for Windows titled Daitoshokan no Hitsujikai: Hōkago Shippo Days was released in August 2013.

A second, adult fan disc titled Daitoshokan no Hitsujikai: Dreaming Sheep was released in March 2014.

A PlayStation Vita port of the original game and fan discs featuring additional content was released in February 2015.

Throughout the game, the player encounters CG artwork at certain points in the story, which take the place of the background art and character sprites.

Throughout gameplay, the player is given multiple options to choose from, and text progression pauses at these points until a choice is made.

After receiving a text from the 'shepherd', which reads his fate is going to change, Kyōtarō encounters a second-year girl named Tsugumi Shirasaki, whom he saves at the train station.

Later that day, Tsugumi enters the Library Club, she thanks him, and asks for his help to make Shiomi Academy a more enjoyable place.

The project was overseen by game director Rune, and the scenario was written by three people: Taku Sakakibara, Hiroyuki Uchida, and Hideaki Anzai.

Character design and art direction for the game was provided by Bekkankō, and CG supervision was handled by Michi.

After School Tail Days), rated for ages 15 and older, was initially sold at Comiket 84 on August 10, 2013 and later for general sale on January 31, 2014.

[19] An adult fan disc for Windows titled Daitoshokan no Hitsujikai: Dreaming Sheep (大図書館の羊飼い -Dreaming Sheep-) was released on March 28, 2014.

[20] A PlayStation Vita port of the original Windows game and the two fan discs under the title Daitoshokan no Hitsujikai: Library Party was released on February 15, 2015.

[21] A manga adaptation, titled Daitoshokan no Hitsujikai and illustrated by Akane Sasaki, began serialization in the May 2012 issue of ASCII Media Works' Dengeki G's Magazine.

[27][28] A third manga, titled Daitoshokan no Hitsujikai: Lovely Librarians and illustrated by Rico, began serialization in the September 2012 issue of ASCII Media Works' Dengeki Hime.

[36] A light novel titled Daitoshokan no Hitsujikai: Overture, written by Noritake Tao and illustrated by Bekkankō, was published by Enterbrain on August 30, 2012.

[39][40] Enterbrain also published a 320-page visual fan book on June 28, 2013, consisting of detailed story explanations, character introductions, rough illustrations, stage commentaries and interviews from the staff and cast.

An original video animation episode was bundled with the first DVD and Blu-ray compilation volumes released on December 25, 2014.

The insert songs are credited to the five heroines: "Natural Garden" (ナチュラルガーデン) by Tsugumi Shirasaki, "Sazanami Tsubaki" (さざなみ椿) by Tamamo Sakuraba, "Yozora no Stairs" (夜空のステアーズ) by Senri Misono, "Kimi dake no Day Star" (君だけのDay Star) by Kana Suzuki, and "Michite, Hiite" (みちて、ひいて) by Nagi Kodachi.

In 2012, Daitoshokan no Hitsujikai ranked four times in the top ten in national PC game pre-orders in Japan.