If you liked the Baka to Test to Shoukanjuu: Matsuri anime, the Anime-Planet community thinks you'd like:
In a world where everyone connects to an online network, pudgy Haruyuki Arita can't seem to catch a break. Constantly bullied, afraid to face reality and paranoid his two childhood friends pity him, the teenager uses online games as a way to escape his problems. But things change one day when Haruyuki's beautiful upperclassman Kuroyukihime approaches him with a mysterious time-decelerating program known as Brain Burst - there‘s just one catch. To keep the ability, he must defeat other Brain Burst wielders in Accel World, an exclusive, virtual MMORPG, and the newbie player will need all the help he can get. Eager to prove he's not a pathetic weakling, Haruyuki joins forces with Kuroyukihime to challenge fierce competitors and discover just how incredible Accel World and he truly are.
If you enjoyed Baka to Test to Shoukanjuu and Baka to Test to Shoukanjuu 2, but perhaps missed all the physical transformation action that was a little light in this OVA, then you'd likely enjoy Accel World. These anime are both based much within a school environment and school life, contain strong elements of 'transformation' into avatars for the sake of battle within a virtual environment, and also contain very similar notes of mismatched love interests and competing females. Both of these series contain a sense of trial and achievement - one with a slightly more contextually serious undertone, and the other with a more comedic one - however both are main drivers in character and plot development throughout each series.