To save a group of players and Asuna from a Boss character, Kirito is forced to play his trump card.

Armed with a large sniper rifle, Hecate II, the young girl Sinon is making a name for herself as the No. 1 sniper in GGO. When her squadron ambushes another squadron, she succeeds in taking out her first target. But when she takes aim at her second target, a robed “Behemoth,” he dodges the bullet.

Carrying the hopes of Cardinal, Eugeo, and Alice in his heart, Kirito stands yet again and visualizes the Black Swordsman, the top player who cleared SAO. For the sake of everyone he’s encountered in this world, Kirito, faces off with Administrator.

Mengetahui yang Alice telah menghilang, Kazuto bergegas untuk keluar dari rumah tetapi dihalang oleh penghantaran tidak diduga: sebuah kotak besar dengan isi mengejutkan.