Sinon und ihre Kameraden versuchen eine PvE-Spielergruppe zu überfallen und müssen dabei eine böse Überraschung erleben.
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.
Sinon, un des meilleurs snipers de tout GGO, rejoint l'escadrille de Dyne, partant à l'attaque d'un groupe de joueurs revenant de la chasse aux monstres...
Tempo addiatro Sinon, all'interno di un dungeon, sconfiggendo il mostro posto a guardia di esso, ottiene una Ultima Ratio Hecate II, che oggi utilizza in una missione che la vede battersi con un osso duro di nome Behemoth, che mette a dura prova le sue abilità di cecchino.
大型狙撃銃《へカートⅡ》を武器とし、《GGO》随一のスナイパーとして活躍する少女シノン。所属するスコードロンの仲間と共に、他のスコードロンを襲撃した彼女は、第１目標の狙撃に見事成功。だが、第２目標として狙ったマント姿の巨漢に、銃弾をかわされてしまう。巨漢はマントの下に隠し持っていた重機関銃を取り出すと、圧倒的な火力で反撃し、シノンらは一転窮地に。仲間たちが弱気になる中、強敵との出会いを求めていたシノンは……。
팀의 작전에 따라 오늘도 몬스터만 잡는 스쿼드론을 노리게 된 시논. 그러나 상대방 일행 중에는 수수께끼의 망토남이 포함되어있었으니…
Sinon continua jogando com o objetivo de ser a mais forte apesar dos rumores sobre as mortes reais assombrarem os jogadores do GGO. Enquanto isso, Kirito toma sua decisão.
Sinon se reúne con un grupo de cazadores de jugadores para poder asistirlos en su aventura. La mejor francotiradora de GGO tendrá que arreglárselas para que la misión salga de acuerdo al plan.
配置著大型狙擊槍"黑卡蒂II"而活躍於GGO世界的中的狙擊手少女詩音。與她所屬的對人集團進行偷襲行動時，成功狙擊第一目標後，對第二目標的巨漢卻是行動失敗收場。同時，該名巨漢在披風下的武器的真面目，居然是一把迷你砲機槍。它的壓倒性的火力，讓情勢一下子逆轉。面對心生退意的隊友們，一心追求挑戰強者的詩音將會...
