Black Butler follows the story of a young earl named Ciel Phantomhive and his demonic butler Sebastian Michaelis on a quest for revenge.

Story (9/10)
The story is fairly unique and well executed, with each arc revealing information.

Black Butler arc: Serves as an introduction to the characters, setting and basic plot of the series. (7/10)

Red Butler arc: Ciel and Sebastian set out to find Jack the Ripper, Shinigami's are introduced. (8/10)

Curry/Indian Butler arc: 2 new characters are introduced, prince Soma and his butler Agni. (7/10)

Circus arc: This is where the story starts getting REALLY good, Ciel and Sebastian are sent to infiltrate the Noah's Ark Circus, as children go missing in every town they visit. This arc has one of best and creepiest antagonist I've seen in anime. (10/10)

Book of Murder/Phantomhive Manor Murders arc: Ciel hosts a banquet at the Phantomhive manor on the queens request and guests mysteriously start dying, 2 new characters are introduced, the queens butlers Charles Grey and Charles Phipps, also known as the Double Charles, this was an overall fantastic and enjoyable arc. (9/10)

Book of the Atlantic/Luxury Liner arc: Ciel and Sebastian have to infiltrate a meeting of the Aurora Society due to them being suspected of illegal human experimentation, this arc provides amazing development to a previously annoying character whom I disliked and made me like and respect her, the action scenes in this arc are one of the best in Black Butler. The Undertaker is revealed as the culprit behind everything and as a grim reaper. (10/10)

Book of Book/Public School arc: Ciel and Sebastian set out to investigate Weston College in disguise as teacher and student under the queens request as Derrick Ardern and other students refuse to return home, Undertaker reappears, it was overall a good arc. (9/10)

Greenwitch arc: Many strange deaths start occurring in southern Germany, with victims that were healthy but suddenly became grotesquely deformed and died afterwards, the queen sends Sebastian and Ciel to investigate, 2 new characters are introduced, Wolfram and Sieglinde Sullivan, one of my favorite arcs in the series. (10/10)

Art: (10/10) Some of the best art I've seen in manga, the art goes perfectly with Victorian and Gothic setting of the manga, the art starts out pretty good becomes better and better as the series goes on.

Characters: (10/10) The main characters, Ciel and Sebastian have a likable charm to them, Ciel is cold, calculating, merciless and morally grey, but is very protective and caring towards his loved ones, Sebastian comes off as a charming, perfect butler, but underneath that facade is a manipulative, bloodthirsty and hungry demon, Sebastian and Ciel have a perfect dynamic and make eachothers characters even more interesting, I love these characters!

Enjoyment: (10/10) I very much enjoyed this series, it's in my top 5 favorite manga.

Overall: (10/10)