Dream Game -Crossover- (ドリーム・ゲーム ―くろすおーばー― Dream Game -Crossover-?) is the first part of a crossover story between the Sword Art Online and The irregular at magic high school series. This part of the crossover was written by Satou Tsutomu, the author of The irregular at magic high school, supervised by Kawahara Reki, the author of Sword Art Online, and published on Dengeki Bunko Magazine volume 39. This story is also a sequel to the eight part Dream Game side story that came with the first eight limited edition Blu-Rays and DVDs of The irregular at magic high school anime. The story of the crossover is continued in Versus II.