Aha, oh how I adore this series. I actually watched the anime, before I got into the manga. But, when I had to wait for new episodes in the anime to come out, I started to read the manga, and I fell in love with the manga, also. There are more moments, between Ciel and Sebastian, in the manga, then in the anime. Hm, I do wish there was a 3rd season, but there can not be, seeing how Sebastian gave Ciel the, "Kiss of Death", (I'm not sure if that is the name, xD;), in the last episode. u__u It really saddened me, but then again, made my fangirliness go off, when Sebastian slid off his eyepatch, then brung his face closer to Ciel's. Oh, how I wish they would of shown the kiss. *A* To me, it hinted that Ciel was a masochist in the last episode, because he was telling Sebastian to make it as painful as he could. Oh gosh. Writing this is really making me want to re-watch the anime.
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Have you ever read/watched: Higurashi (any of the series), Umineko no Naku Koro ni, or Doubt? If not, I really recommend them. :]