Sword Art Online Progressive, Vol. 7 (manga)

The mysterious player Mortehas manipulated the human guilds into fighting BOTH side of the Elf War! WhileKirito challenges him to a duel, Asuna has an important task of her own: stealthe battle plans from the Forest Elves so she can end this quest before it turnsdeadly. They need to stop the war before someone loses theirlife--permanently!