Sword Art Online Progressive, Vol. 7 (manga) — Reki Kawahara

The mysterious player Morte has manipulated the human guilds into fighting BOTH side of the Elf War! While Kirito challenges him to a duel, Asuna has an important task of her own: steal the battle plans from the Forest Elves so she can end this quest before it turns deadly. They need to stop the war before someone loses their life--permanently!