So, I'll give you fair warning that this one is kind of strange. However, keep in mind that Japanese people are much more open to gender "bending" for lack of a better term. Visual Kei is widely accepted and explains why the more flamboyant characters on this show are no big deal.
With that out of the way, I'll give you a little background on this show. It follows a young orphaned child name Ciel Phantomhive who has inherited a large business empire after his parent's murder. He of course, makes a pack with a demon butler named Sebastian to seek revenge on those who would disgrace his family name, in exchange for his soul. The relationship between the characters can be a bit odd sometimes, but this appeals so much to my inner gothic sensibilities that I overlooked it. This part of the anime only ran for 24 episodes, but ended with a pretty good twist.
There is a Black Butler 2, that follows a different butler and a different boy, but with the same premise. It features appearances of characters from the first series, so they are still kind of tied together. The second series is ok, but I prefer the first one.
Overall, I would have to say unless you really like gothic or Victorian themes, this one might not be for you. I enjoyed it because I love animes that are dark but still add a bit of humor. I'd say at least watch the first episode and see how you like it!