By its eleventh expansion pack, the massively multiplayer online role-playing game (MMORPG) Elder Tale has become a global success, having a following of millions of players. However, during the release of its twelfth expansion pack: Homesteading the Noosphere, thirty thousand Japanese gamers who are all logged on at the time of the update, suddenly find themselves transported inside the game world and donning their in-game avatars. In the midst of the event, a socially awkward gamer called Shiroe along with his friends Naotsugu and Akatsuki form a guild called Log Horizon so that they may face this world which has become their reality along with the challenges which lie ahead.
from Wikipedia

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Notes

Genre: Action, Adventure, Fantasy
Demographic: Shounen
Adapted form the light novel series, Log Horizon - Novel. Also see the anime, Log Horizon.