I love this anime! I had seen it before on Hulu but they only had the second season, and I hate starting something in the middle so I didnt watch it. However while I was surfing Netflix for something to watch I noticed they had the first season so I thought I would give it a try.
The series is somewhat morbid but you can't help but get drawn in. Basically it is about the demon butler (see? morbid!), Sebastian Michaelis, who serves his master Ciel Phantomhive in avenging the death of his parents and in return Sebastian will get his master's soul.
I know it sounds out there but once you watch an episode it makes a bit more sense.