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. Kirito's experience with the beta version of the game has put him far ahead of the curve, but it has also attracted the attention of some dangerous players…For Asuna, his competence has been a god send in this harsh world, yet she can't help but feel like her overreliance on Kirito's skills is becoming an obstacleto their growing relationship. Even so, they'll have towork together to make it through the ancient ruins ofthe fifth floor, where all sorts of undead monsters—and player-killers—lurk in the shadows!