Trapped inside the MMORPG Elder Tale along with thirty thousand other players, guild master Soujirou Seta leads the West Wind Brigade, a mid-sized guild so lopsidedly female that other adventurers call it the Harem Guild. This spin-off manga follows Soujirou and his guildmates working out how to survive, and get along with each other, now that logging out isn't an option. It runs alongside the main Log Horizon story, showing the same catastrophe from the West Wind Brigade's side of Akihabara.