Story : The story clearly takes place between 1st and 2nd season. As written above, it's main purpose is to shorten the gap between 1st and 2nd season.
If you've finished just 1st season, this is just like watching another episode of it. If you've seen 2nd season too, it's pretty much a flashback, but a very critically needed one. I myself was pulled in the story once again and honestly can't wait to see the rest. So the conclusion : Story 10/10 .
Art : The art is the same as in 1st season and it's flawless. We get to see clearly the facial expressions, emotions, action scenes are great and so on. Gets 10/10 from me, nothing ever annoyed me at the art used here.
Sound : Sound's awesome like always. There's even some new awesome OST used in comparison to 1st season, you'll enjoy the episodes greatly as the OST used just suits it as it should. Gets 10/10 from me.
Character : Alright, we get to see only the two main protagonists from the 1st season here, Hei and Yin. Despite all that though, there are some new guys appearing to the end of 1st episode and it seems to be worth it.
The most astonishing at character is the development itself. We get to see the Yin's emotional and mental growth despite her being a "doll"... After seeing 1st episode and with the knowledge of 2nd season, let me announce that she isn't a true doll at all, just partially. (Especially with the new found power she has)
Gets 10/10 from me, flawless.
Enjoyment : This is a bit tough. If you've just seen 1st season, the enjoyment here will be top notch as it has the atmosphere of 1st season and unbelievable development of two main protagonists. If you've seen 2nd season too though, this is going to be painful.
Overall : If you get to see this and you're a fan of DtB, get some nerves reserved ahead. Currently a very long wait for next episodes awaits us all and enormous mass of people hopes there will be another season, explaining the WTH 2nd season ending.
Shamefully this is just 4 episodes, but I believe it's worth seeing it, worth at any cost =) I'm definitely sure this season is going to be top notch, so if you really liked first episode, good luck at waiting for the other three ones! =) Long live DtB!
