Accel World, Vol. 4 (light novel): Flight Toward a Blue Sky — Reki Kawahara

Prepare for a full dive!
Seiji Nomi 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...?