After watching the first 12 episodes, I knew there had to be more; these two special episodes conclude this season's plot.
In lieu of an in-depth review, I'll try to be brief as it's only two episodes.
It continues where it left off and finishes strong. My only issue with the plot is Nemesis; she's a likable character, but the writer gave her such an uninspired goal. And even if she succeeds, I'm not sure what that exactly does for her. But maybe it isn't fair to criticize her intentions because we still don't seem to know much about her.
Yami's transformed appearance, in my opinion, is quite beautiful. Her face and expressions, in the final minutes of the last episode, are drawn really well. Furthermore, the action sequences are animated exceptionally well.
The opening is great, and the ending is even better, but unfortunately, the BGM wasn't very memorable. Voice acting was amazing as always, especially Yami's voice actor this season; she does three different character voices (Yami, Yami Transformed, and Tear).
As one would expect after watching episode 12, these final two episodes focus on Yami's character. Moreover, Rito's actions, at this season's climax, are something to look forward to as well. Lala changes too, but I can't say anything more without spoiling it.
What can I say? I'm a huge fan of the show. Ultimately, if you're looking for closure, you'll find it in these last two episodes.