Sword Art Online Progressive Volume 04


 * This article is about the original Progressive light novel volume. You may be looking for the manga adaptation.

Sword Art Online Progressive Volume 4 (ソードアート・オンライン プログレッシブ 004, Sōdo Āto Onrain Puroguresshibu 004) is the fourth installment in the "Progressive" series, a reboot of the original Sword Art Online light novel series written by Kawahara Reki. This volume covers the events that took place while clearing the 5th Floor of Aincrad. It was released on December 10, 2015.