Story: 5/10
The story was okay. It's not as interesting as the description of the series would make it to be. It had alot of history mentioned in the plot but who cares when it was basically about a vampire who is an old war hero moving his brother to a new place so he could experience friendship. They could have put the history in the scenes if it was really all that important, therefore the 12 episodes would have been worth it. This could have easily been an ova/ona series. It wasn't really any need to drag it out to 12 episodes. I wouldn't say the pace was slow (for me anyways) but it was dragged out. It reminded me of the series 2005's Guyver they could have easily been less than 26 episodes. There were no fillers or side stories in Black Blood Brothers. It did have flashbacks to Kotarou and Jirou spending time to get when Kotaruo was a female. The conclusion was good mostly because I was happy it was ending. It hinted at continuation of the story but it didn't end badly to where there were big questions unanswered.
What I liked about this series:
What I liked about this series is the comedy and not in the way you think. On the anime data news base sites that I have seen they have this series in the genre of comedy. Which I find it was dry on comedy. What I did find funny is that if he wanted to protect his brother wouldn't it have been smart if he DIDN'T wear a rich red suit with a funny looking wizard hat to match? Wouldn't that make him...STICK OUT?!! lol (Interesting note about Jirou's costume is that it looks like a Hellsing ripoff.)
Something else I found hilarious was in episode 5. When Jirou mentions that he could tell Mimiko was a virgin she becomes embarrassed and pushes Jirou on the street with little Kotarou on his back. Trying to dodge Mimiko's kicks, Jirou then rolls on the floor laughing squishing Kotarou who is still on his back. IThe person who was watching this series with me and I started laughing frantically. I had to pause the episode to get all my laughing out.While Jirou was laughing trying to dodge Mimiko's kicks didn't he realize he was steam rolling his little brother that was on his back? (lol) So in short, I liked the series because it was so lame that I could get a good laugh off of it.
Art: 5/10
The art in the series was weak. It had nice see through curtains in the first episode. Contained the goodies like hair shine, eye freckles, nice water detail (in one scene though the rest of the water detail was okay) and light/sun beams but it was still lacking over all. Although I'm a big fan of red the color scheme was average at best.
Sound: 5/10
I watched the english dubbed version on netflix so the sound review is for english dubbed. The voices were lifeless and borderline boring which is one of the biggest reasons why I don't like to watch dubbed anime because they usually fail to bring any personality to the table.
The beginning song is a big pass. It was attempt of rock that I didn't appreciate. The background music could have been better but it wasn't annoying. The end song, I actually liked. I wouldn't run out and buy it, but it is a highlight of the series but that may be because it's an end of me wasting my time....lol.
Character: 5/10
The characters introduced played their part but none of them made me interested in learning more about them.
Enjoyment: 5/10
It wasn't unbearable but if they would have dragged it longer than 12 episodes I would be writing a suicide note....lol
Overall: 5/10
It all averages out to 5/10 and I would add it's mediocre at best.
Would I recommend to someone else? I would have to think about that. If someone thought the animes I think are lame were cool and they were into vampire stories than I would recommend this to them other than that I wouldn't recommend it. The story summaries on the anime news databases is about as deep as it goes.
