Sword Art Online is based on a novel by Reki Kawahara and is a recognizable anime series that follows the adventures of the young protagonist, Kirito, in a groundbreaking Virtual Reality Massively Multiplayer Online Role-Playing Game known as Sword Art Online.

This latest entry in the series is based on an all-new scenario “War of Underworld” that is unique to this game and includes more characters and episodes than ever before, to deliver a setting different from the source material and the anime.

If Kirito and Eugeo were here...

The threat of annihilation is approaching for the Underworld, a virtual world designed to give life to the superior AI known as A.L.I.C.E. The “Final Stress Test” served as the beginning of the end... The gate that separates the Human Empire and the Dark Territory has opened, causing the shadow of war to fall upon the two worlds.

Just then, a dark knight accompanied by a young girl invades the gate in front of Kirito and his companions...

“What is the difference between the world ending and me dying?” Who is this girl who seems destined to meet a tragic fate and ultimately bring an inevitable “perfect” end to all things? With the answers to such questions shrouded in mystery, a story of life itself is ready to unfold...