Log Horizon: West Wind Brigade

Log Horizon - West Wind Brigade is a spin-off manga of the Log Horizon light novels, revolving around the titular guild. It currently has three volumes, with a fourth slated for an October 6, 2014 release.

The Catastrophe arc
The manga begins after the Catastrophe sucked everyone playing Elder Tale at the time of the Homesteading the Noosphere expansion pack's release into the game. Soujiro Seta, guild master of the West Wind Brigade is the first one among himself, Isami, and Nazuna to awaken. As he looks around confusedly, other players who had also awoken start creating a ruckus, all panicking and confused by the situation. After the two members of his guild that are with him awaken, they end up going into the forest to assist Kawara, who had gone in to chase after two new players. Successfully defending the new players and experiencing fighting in the world of Elder Tale for the first time, D.D.D shows up to pick up the two kids. Afterwards, the four West Wind members return to their guild hall.

Round Table Alliance arc
Similar to the light novel and the anime, Soujiro meets up with Shiroe and Nyanta when the new guild needs help to accomplish its goal. The West Wind Brigade agrees to help run the Crescent Moon Refreshment Stand.

While helping out, though, they come in conflict with some nobles who want to know the secret to tasty food. In the middle of that, someone fires an arrow into the middle of the crowd.

Soujiro attends the Round Table Conference, watching as Shiroe controls the meeting, and agrees to the formation of the Round Table Alliance.

Conflicts with the Light Novel

 * In chapter 14, Isami uses Soujiro's Phantasmal katana. However, it has been stated in the light novel that it is impossible for a player to use a Phantasmal item if he or she is not the player who first acquired it.
 * Although it hasn't been stated whether Adventurers can get sick in this world, chapter 20.5 has several of the girls fall ill with the Japanese cold.