Elements is the 10th volume of the Accel World light novel series, published on December 10, 2011.
2046--Haruyuki, member of the reborn Nega Nebulus, is a new Burst Linker. Through hard work, he finally reaches level two--only to find himself with just eight burst points left!! With one wrong move, Haruyuki could lose access to Brain Burst forever...Refusing to take his friend's points, Haruyuki turns to the Accelerated World "bouncer," a mysterious person with the duel avatar Aqua Current.
One year later, the Black King, Kuroyukihime, is on a school trip in Okinawa! With nearly all Burst Linkers located in Tokyo, Kuroyukihime assumes she'll have a relaxing vacation...until she's suddenly challenged to a duel! Later, on a seemingly normal day, Haruyuki is issued a challenge...from a player in black, wielding two swords! Dive into Accel World's past in this thrilling short story collection!