Sword Art Online Alternative Gun Gale Online, Vol. 6: One Summer Day (light novel) — Reki Kawahara

One month after the third Squad Jam, Karen Kohiruimaki is starting to consider her options outside of GGO...but fate won't let that happen! Out of the blue, past prizewinning SJ teams receive invitations to playtest a GGO game mode with an all-new objective: capture a base defended by hyperadvanced AI NPCs. As Llenn reluctantly agrees to participate in the hopes of fulfilling her promise of a rematch with SHINC, she can't help but wonder: Just how challenging can these AI NPCs possibly be?