A year has passed since  Sword Art Online ( SAO) was cleared.  Kirito is asked by  Kikuoka to investigate  Gun Gale Online, specifically  Death Gun, a weapon which seemed to link deaths in the virtual reality world to those in the real world. Upon entering the game,  Kirito meets  Sinon who teaches him the ropes of the game. They both enter the Gun Gale Online tournament,  Bullet of Bullets. Kirito displays his amazing skills although he is only a newcomer to the game. Later, Kirito finds out that the mysterious deaths are linked to a red guild named  Laughing Coffin in SAO.