Following on from the previous film, Sword Art Online: Progressive – Aria of a Starless Night, the main characters, including Kirito (voice of Yoshitsugo Matsuoka) and Asuna (voice of Haruka Tomatsu), have made it to the fifth floor of an on-line game where the players are trapped inside and are not only fighting for their lives in the game but also for their real lives beyond it. There are two main guilds battling each other for leadership status; rogue individuals trying to kill off players; and virtual monsters and ghosts to fight in the dungeons and catacombs. Consequently, Kirito and Asuna work together to organise a small group to outmanoeuvre the warring guilds, destroy the floor boss and level the playing field, giving each trapped individual an equal chance at survival. The only problem is that the game is adapting and intent on destroying them all. Will Kirito and Asuna succeed or will they perish in the process?