Versus

Versus is the «Sword Art Online» and «Accel World» crossover published on December 10, 2011 in Volume 10 Chapter 3 of Accel World. It was also adapted into one of the tracks of Accel World + Sword Art Online Drama CD.

Summary
Kirito tests the «4th-Generation FullDive Experimental Unit» and enters the Umesato Middle School Local Network by accident. Haruyuki Arita refexively attacks him and they fight. Ultimately the battle is stopped before either lands a decisive blow, and both think that the other would have won.