April 2024. As vice-commander of the most powerful guild in SAO, the Knights of the Blood Oath, Asuna is now fighting on the front lines, and has advanced to the 59th floor.
It is then that a male player named Kains dies in a village that can't be invaded by monsters (an Area).
Hearing a witness's scream, Kirito and Asuna rush over to investigate, and find that the man couldn't have been killed in a duel (PK - Player Kill).
Fearing that there might be an unknown PK skill, Asuna joins Kirito in trying to get to the bottom of the incident.

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