Sword Art Online, the first full-dive VRMMO, was supposed to be a dream come true, but it has become a deadly game where dying in the virtual world means dying for real. Emirun and Rex, who knew each other before in the real world, meet again by chance inside SAO and join a scouting party to learn how to stay alive. Then a mysterious player killer called the Black Swordsman wipes out the whole party. Emirun arrives to find Rex collapsed in despair with the killer standing over him. Resolved to avenge their comrades, the two seek out Asuna, a legendary prodigy with the sword, and begin intense training under her. This action adventure film is set in a death game where players turn on one another.