Kirito is sent into GGO to investigate a player named "Death Gun," who has the ability to kill people in the real world by killing their avatars in-game.
It recaps the tournament where Kirito and Sinon eventually team up to identify and defeat the assassin. Sword Art Online II: Debriefing
[Spoilers] Sword Art Online II: Debriefing - Recap 1 [Discussion] Kirito is sent into GGO to investigate a