Log Horizon (2013)

Elder Tale is an online fantasy RPG that has become popular worldwide. But when its twelfth expansion package, "Novasphere Pioneers" is installed, thirty thousand players in Japan are trapped inside. Among them is grad student Shiroe, who isn't very good at interacting with others. But to survive in a world full of monsters, he forms a guild called "Log Horizon" with an eclectic group of other players.