Sword Art Online Progressive Scherzo of Deep Night, Vol. 1 (manga)

Nearly two months have passed since Kirito and Asuna found themselves trapped in the world of Aincrad. Now, they're making their way through the ruins-themed fifth floor, where all sorts of undead monsters�_"and player-killers�_"lurk in the shadows! The story of Sword Art Online continues in this brand-new series!