Kirito and Eugeo's battle to save Alice is well underway, but there's still a long way to go as they climb the many floors of the Cathedral to rescue their long-lost friend. With the combined skills of the powerful Integrity Knights standing in their way, this intrepid duo will require all of their amassed abilities to survive and progress.

On this journey, Kirito will uncover all manner of truths about Underworld and the Administrator which presides over it, while unbeknownst to him events in the real-world threaten his physical existence - and those of others close to him - in alarming fashion.