Accel World, Vol. 19 (light novel)

with Sky Raker and learn the clear conditions
of Brain Burst as well as what lies at the pinnacle of the Accelerated World.
When they arrive, they are warmly received by the dark silhouette of the
dual-bladed swordsman, Graphite Edge! But Haruyuki can't afford to be stopped at
this critical juncture. For in addition to finding the answers he seeks,
Haruyuki learns that the Castle is home to The Fluctuating
Light!