As per the confidentiality contract, any memories created by the machine in the virtual world are wiped upon returning to the real world.

He works there as a part-time employee to test the system's capabilities in the Underworld: the fantastical realm generated by the Soul Translator. The private institute Rath aims to perfect their creation by enlisting the aid of Sword Art Online survivor Kazuto Kirigaya. Singer ReoNa will once again provide the game’s theme song.The Soul Translator is a state-of-the-art full-dive interface which interacts with the user's Fluctlight-the technological equivalent of a human soul-and fundamentally differs from the orthodox method of sending signals to the brain. In addition to new original characters like Dorothy, the trailer and website features characters who played roles in the War for Underworld story, like Shuster (aka Shasta), Lipia, Iskahn, and Dil, leaders of the Dark Territory’s armies. It’ll have the largest playable character roster in the franchise so far, and the largest number of story episodes.

Sword Art Online: Last Recollection will adapt the new events of War of Underworld to the unique, game-original timeline that’s persisted through the various Sword Art Online game adaptations. Dorothy seeks to bring an end to her unchangeable fate, one that leads her to ask what the difference is between the world ending and her dying. A new character, a dark knight known as Dorothy, escapes the Dark Territory with Sarai. The gate between the Human Empire and the Dark Territory is breached, and “Final Load Test” - a massive invasion intended to test the potential of the A.I. As in the original story, the virtual environment of Underworld (where Kirito and his pals were trapped during the events of Alicization Lycoris) is on the verge of ruin. The Sword Art Online: Last Recollection teaser and official website lay out the premise, which adapts the “War of Underworld” story from the original novels and anime.

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