On Aincrad's sixth floor, Kirito and Asuna arrive at the town of Stachion to find puzzles built into everything from its layout to its shopkeepers' riddles. A close call with the player-killer Morte and his gang pushes the pair toward the dark-elf fortress Galey, where their old ally Kizmel reveals a clue about the poison Morte used against them. This manga adapts the sixth-floor arc of the Sword Art Online: Progressive light novels.