Histoire
The world falls into a state of panic when 120 million players of a popular VR game, Eternal World, vanish without a trace one day. A few months later, they begin returning one by one after dying in the game. But they’re not the only ones to make it back—monsters also start to appear and wreak havoc on Earth. All hope seems lost until the Masked Monarch, the most powerful player of Eternal World, returns. He quickly assembles his old team back together to defeat the beasts and the nefarious Demon King once and for all.
Synopsis via AniList (en anglais).