Memories of Fresh Blood
While walking home, Asada Shino, Sinon's real-life counterpart, is bullied by three schoolmates, but they are warded away by her friend Kyōji Shinkawa, who introduced her to GGO in the first place, as a form of immersion therapy for her fear of guns. After talking about their personal lives, Shino leaves for home. There, she tries holding a gun replica, but this induces a flashback to when she was eleven years old; while she was at a postal office with her mother, a man carrying a gun tried to rob the office, shooting an employee and threatening to kill other people. When the robber aimed his gun at her mother, Shino attacked him, wrestled the gun out of his hand, and shot him repeatedly, killing him. The flashback triggers a panic attack from Shino. Meanwhile, Kirito informs Asuna that he will be converting his ALO avatar to GGO, which surprises her, but she approves. As Kazuto, he goes to the hospital to log into GGO, while his real-life body will be watched by Aki Natsuki, a nurse who oversaw his condition while he was trapped in SAO. Shino logs into GGO as well. Meanwhile, an unknown figure overhears an online voice-chat discussing Death Gun before looking at a photo of Sinon, grinning hungrily.
Aired 19/07/2014EP 3 - Memories of Fresh Blood

Sword Art Online II
One year after the SAO incident, Kirito is approached by Seijiro Kikuoka from Japan's Ministry of Internal Affairs and Communications Department "VR Division" with a rather peculiar request.
That was an investigation on the "Death Gun" incident that occurred in the gun and steel filled VRMMO called Gun Gale Online (GGO). "Players who are shot by a mysterious avatar with a jet black gun lose their lives even in the real world..." Failing to turn down Kikuoka's bizarre request, Kirito logs in to GGO even though he is not completely convinced that the virtual world could physically affect the real world.
Kirito wanders in an unfamiliar world in order to gain any clues about the "Death Gun." Then, a female sniper named Sinon who owns a gigantic "Hecate II" rifle extends Kirito a helping hand. With Sinon's help, Kirito decides to enter the "Bullet of Bullets," a large tournament to choose the most powerful gunner within the realm of GGO, in hopes to become the target of the "Death Gun" and make direct contact with the mysterious avatar.
(Source: Crunchyroll)