One day, while playing the online game Elder Tales, 30,000 players suddenly find themselves trapped in another world. There, eight-year veteran gamer Shiroe also gets left behind. The trapped players are still alive, but they remain in combat with the monsters. The players don't understand what has happened to them, and they flee to Akiba, the largest city in Tokyo, where they are thrown into chaos. Once proud of his loner lifestyle, Shiroe forms a guild called Log Horizon with his old friend Naotsugu, female assassin Akatsuki and others.
The world is ruled by spirits, goblins, and all manner of strange creatures. Human beings are persecuted, to the very point of extinction. One day, a golem and a lone human girl meet.
This is a record of the pair, one a member of a ruined race, the other a watchman of the forest. It tells of their travels together and of the bond between father and daughter.