.hack//The Movie: Sekai no Mukou ni

Both anime tell story about The adventure in Virtual World MMORPG + From friends become lover + In some fight scene, MC fighting in group not alone + Both MMO (The World & SAO) turn become dangerous game which not only affect the players but also the real world  

Both anime tell story about The adventure in Virtual World MMORPG Similarity : + MC lack confidence against itself + From friends become lover + In some fight scene, MC fighting in group not alone + Half of the story about MC learn about leveling his/her avatar Different : + Gender Bender (//hack) + Harem (Accel World)  

Similarity : + Action-Adventure anime set in Virtual MMORPG Different : + In webdiver player avatar is same with human version but in hack the player even can choose opposite gender + .hack// is almost like MMORPG (farming & leveling), something not found in webdiver 

+ CGI Movie + Based from games + MC must fight to save his/her "world" from destruction  

both are movies about a world famous game that is hacked by a virus that could destroy the world and only a certain group of people can stop it by gathering an army of avatars and waging a war through the game 

Similarity : + Figthing in virtual reality world + CGI movie (The Animatrix 1st Arc is CGI movie if you don't know) Different : + The animatrix is much more darker, violent, and heavy atmoshpere compared to .hack//  

CG movie, both are very similar, a normal girl going on a weird fantasy-filled adventure that she'll never forget.