Accel World, Vol. 6 - manga (Accel World (manga), 6)

When Kuroyukihime returns from her school trip, she finds that Nega Nebulus has had quite the harrowing adventure in her absence, having been taken very much to task by a new threat--Dusk Taker! It seems, though, that the Black Legion has emerged stronger than ever and with two new members to boot! Could it be that they are ready to tackle a new challenge and take their adventures to the next frontier...?!