Flight Toward a Blue Sky (蒼空への飛翔, Aozora e no Hisyō?) is the 4th volume of the Accel World light novel series, published on February 10, 2010. It is the second and final volume of the Dusk Taker arc.
Noumi Seiji is a mysterious new student whose skillful use of Brain Burst abilities in the real world has boosted him to astonishing heights of achievement (not to mention astonishing heights of jerkitude). When Haruyuki's wings are stolen by Seiji's cunning and ability, Haruyuki suffers a crushing defeat. Stripped of his greatest ability, will Haruyuki ever be able to rise again...?