Cold-Hearted Sniper
In a flashback, on September 14, 2025; Sinon, who had accidentally fallen down a trap chute while navigating a dungeon below SBC Gurokken, discovered a boss-class monster and decided to die while trying to defeat it. To her surprise, the position she chose for her attack was out of the monster's attack range, thus, by conserving her ammo and accurately hitting the boss's weak spot, she was eventually able to defeat it and acquired a new sniper riffle, the PGM Ultima Ratio Hecate II. After Sinon successfully attacked the first target of another squadron for her own's, she attempted to snipe the second target, but that giant man named "Behemoth" manage to dodge the bullet, took out a heavy machine gun, which was hidden under his cloak, and started fighting back with its overwhelming power which cornered Sinon and those in her squadron. But in the aftermath of battle Sinon emerged victorious even if her left leg was cut-off in the process. Meanwhile, in Alfheim, Kirito planned to tell Asuna about something.
Aired 12/07/2014EP 2 - Cold-Hearted Sniper
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)