Accel World (GN 6)

With the addition of Chiyuri (Lime Bell), the Black Legion of Nega Nebulus now has four members. But when Kuroyukihime leaves the group to go on their school trip, her absence casts a pall over the friendship of Haruyuki, Takumu, and Chiyuri, threatening its very foundation. When Kuroyukihime returns to find Haruyuki cornered by the ruthless Dusk Taker, Haruyuki tells her everything! And with the appearance of Fuko Kurasaki--Sky Raker--the manga adaptation of Reki Kawahara's futuristic science-fiction novel series just keeps accelerating!