Tập 1: Death Gun bắn một người chơi trong Gun Gale Online, khiến Kirito điều tra các cái chết ngoài đời thực có liên quan đến trò chơi.

Nearly a year after the Sword Art Online incident, a new VRMMORPG known as Gun Gale Online has taken Japan by storm. One day, as a top-ranked player named XeXeeD appears on a streamed broadcast via his avatar, a cloaked man calling himself and his weapon "Death Gun" fires a bullet at XeXeeD's avatar through a video screen, causing XeXeeD to suddenly convulse and disconnect. A month later, Kazuto Kirigaya is called to meet up withKikuoka Seijiro of the Ministry of Internal Affairs' Virtual Division, who reveals that XeXeeD's user was found dead of acute heart failure a few days after his avatar was shot, also showing evidence of a similar case involving the death of a second Gun Gale Online user. As Kirito states his doubts that a game could cause someone's heart to fail, Kikuoka, believing Death Gun is specifically targeting professional GGO players, asks Kazuto to once again take up the role of Kirito and investigate what is causing the victims to die. Remembering all the people who died in SAO, Kazuto thinks over his decision whilst spending time with Asuna at the park. Meanwhile, in the world of GGO, a sniper known as Sinon is in top form. (Source: Wikipedia)

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