Sword Art Online Alternative Gun Gale Online Novel Volume 6 was written by Reki Kawahara and Keiichi Sigsawa with illustrations by Kohaku Kuroboshi.

A month after the end of the third Squad Jam, a mysterious email is sent to former contestants all across the country. The email contains an invitation to brand-new game, and only the top contenders from the past three Squad Jams are allowed to participate! With objective of capturing bases as opposed to an all-out deathmatch, this new game mode has a completely different feel from Squad Jam. A fitting stage for the long-awaited rematch with SHINC!