Originally based on a novel by Reki Kawahara, Sword Art Online is a renowned anime series that follows the adventures of its young protagonist, Kirito, within the next-generation Virtual Reality Massively Multiplayer Online Role-Playing Game world called Sword Art Online.

This latest addition to the series is based on an entirely new “War of Underworld” story, unique to this game, and features more characters and episodes than ever before, in order to depict an environment different from that of the original material and the anime.

Story

If Kirito and Eugeo were here... The threat of annihilation approaches for the Underworld, a virtual world designed to spawn the ultimate AI called A.L.I.C.E. The “Final Stress Test” served as the beginning of the end... The gate separating the Human Realm 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 breaks through the gate in front of Kirito and his companions... “What is the difference between the end of the world and my death?” Who is this girl who seems destined to meet a tragic fate and ultimately brings an inevitable “end” to all things? With the answers to such questions shrouded in mystery, a story about life itself is ready to unfold...