Log Horizon is a Japanese novel series written by Mamare Touno and illustrated by Kazuhiro Hara. It began serialization online in 2010 on the user-generated novel publishing website Shōsetsuka ni Narō, being later on acquired by Enterbrain and published as a light novel in Japan since 2011. Yen Press began publishing an English translation in 2015. The series follows the strategist, Shiroe, and the other players of the long-lived MMORPG Elder Tale after they find themselves whisked away into the game world following a game update.
The novel has received four manga adaptations, with one based on the main story and the other three revolving around characters in the series. An anime television series adaptation animated by Satelight aired on NHK Educational TV between October 5, 2013 and March 22, 2014. A second season by Studio Deen aired between October 4, 2014 and March 28, 2015. A third season by Studio Deen is set to premiere on January 13, 2021.
By its eleventh expansion pack, the massively multiplayer online role-playing game (MMORPG) Elder Tale has become a global success, with a user base of millions of players. However, during the release of its twelfth expansion pack: Homesteading the Noosphere, thirty thousand Japanese gamers who are logged on at the time of the update suddenly find themselves transported into the virtual game world and donning their in-game avatars. In the midst of the event, a socially awkward gamer named Shiroe, along with his friends, Naotsugu and Akatsuki, decide to team up so that they may face this world, which unfortunately has now become their reality, along with the challenges and obstacles ahead of them.