Accel World

is a Japanese light novel series written by Reki Kawahara, with illustrations by HIMA. The series began publication on February 10, 2009 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
No matter what age it is, the "Bullied Child" will never disappear. The overweight, Middle School student, Haruyuki, was one such kid. The only time he could relax completely, was when he would play a squash game on the local network the school had set up. He loved playing this simple game as he can forget painful times while immersed in it. It was fall. He was passing his time like this until one day, he had an encounter with the school's most beautiful, refined girl, "Kuroyukihime", which changed his life abruptly. Introduced to the software she transmitted, Haruyuki learned about "Accel World." A program that enhances one's mind capabilities, with certain side-effects. It was the moment the guy on the lowest rung at school became "Burst Linker," protecting the Princess as her knight.

Accel World
An anime adaptation of the first 4 volumes of the light novel aired for 24 episodes between April 7, 2012 and September 22, 2012