Sword Art Online Progressive, Vol. 5 (light novel) - Reki Kawahara

After successfully untangling themselves from a dangerous encounter with n the Black Poncho Man and clearing the fifth floor of Aincrad, Kirito and Asuna n head to the next challenge, an area filled with...puzzles? n What's more, n because of the precarious balance of power between two large guilds aiming for n the same item, The Flag of Valor, there's also a murderous PK group to be wary n of. As the problems seem to pile up, Kirito and Asuna face the sixth floor of n Aincrad completely unaware of the malicious trap awaiting them!! n