This movie disapointed me. I'll be very plainspoken, of course, with some spoilers.

You have 40 minutes of, ~~if you already watched Accel World~~, repetition of the anime, narrating (Kuroyukihime is the narrator) everything that happened in the anime, like DragonBall :P.
After this nonsense repetion, ~~because if you want to watch a movie about an anime, please, watch the anime before~~, they start the history of movie. Yeah, you just see the opening of the movie after 40 minutes of movie.
Well this new history have some characters that nobody explains how they entered in nega nebulus (black legion). ~~If this happened in anime, I really don't remember and if they explained all the anime why not this?~~ They are expanding the territory of black legion, when suddenly everybody is disconnected.
When they start to investigate, they discovered that a "divine" burst linker~~(that you don't know who is because they simply doesn't explain)~~ are causing this. While they are fighting against this "divine" burst linker, appears another "divine" burst linker that helps Silver Crow and Black Lotus ~~(with the power of love, like SAO :&)~~.
Of course, they win the fight ~~(this fight was very boring :( )~~ and they become friend to of the burst linker behind all of this ~~(This is not explained with a convincing way)~~.

Summarizing all this review, the movie expend a lot of time explaining unnecessary things and doesn't have time to show the movie history, so everything in this new history is not explained and (I don't know why) suddenly everything is solved with the power of love S2.
You expend the last 40 minutes (this is the duration of the new history), thinking: Who is this character? Why this character is legendary? Who sealed this character? Oh wait, when this character appeared? While everything is thrown in your face.

~~*If you notice some misspelling in this review, sorry I'm learning english and please explain to me where is the mistake and how to correct.~~