Simplicality
Homicidal Desires
aaaaaaand well...... Mostly I kept reading because of Sebastian ;w;
but then the plot got really interesting.
Watched the anime just for the hell of it (no pun intended)
So the story line eventually develops into an enticing plot? That awesome! From the few episodes I've watched (and this was a while ago so feel free to correct me if I'm wrong) but the show just seemed to be one of those "new story a day" kind of shows that hinted to a bigger plot in the background, which I'm assuming eventually rises to the surface of the show and caught your attention.
Well, the main, main plot (Ciel getting revenge) hasn't gone anywhere far even in the manga yet since, well, when he gets what he wants Sebastian will eat his soul. But the story arcs still keep me wanting to read more even though it has (or it seems to have) little to do with revenge stuff. And now there is still some unfinished stuff from the previous arc that probably will be important later.
It has action, drama, comedy and the story and the characters are enjoyable to me. And for some of the characters, you just want to know more and stuff like that. Also, ordinary things become epic! xD It's really funny.