This anime enchanted me the first time I watched it. It has a little something for anyone watching, shounen-ai fans, action lovers, history people who aren't nit-picky about accuracy, supernatural/fantasy addicts, and those looking for a bit of traumatic drama. The story-line is deep and non-repetitive, with minimal but still entertaining tangents. Most of the characters are dynamic and aren't completely single layer characters (and those that are, are still quite lovable).

For you romance fans, this anime covers all types. This anime is not completely made up of guys, like many yaoi series are and many of the characters have multiple possible love interests of both genders, but these relationships are not a screaming focus. Shipping fans of either team will find their favorites in this anime.
Action lovers and supernatural addicts, you get to witness battles between many different non-human people such as demons, angels, demon dogs, and shinigami (grim-reapers). Let me tell you, they are fantastic to see.
History buffs, if you're reading this review you probably already know that it's set in Victorian Era England. Some actual events and relations are addressed in the anime, though some in unrealistic ways, such as the Jack the Ripper murders and the Opium wars and Britain's handle on India at the time.
Drama seekers will find this anime intriguing also. Ciel specifically has an unspeakable past that he is trying to avenge (though I won't say anymore since I might spoil it). He is quite the twisted character.

The storyline really is deep and lacking many tangents. There is an unrelated episode here and there, but they do help explain and develope the characters. Plus they are fun and do help relieve from the heavy storyline at times.
Characters are all fantastic. They all have many levels in them, hidden selves they don't want others to see. Only a few proudly display their innermost thoughts with pride and they are all almost immediately lovable, shinigamis tend to do that

I'm quite picky about anime these days, and I wasn't too sure about Kuroshitsuji because of its popularity. It's not as though I'm one of those people who doesn't like something because a lot of people do, but my experience with popular anime is that I end up feeling that they are overrated. But, I saw a lot of artwork and stills of the show, so I gave it a shot, and I'm sooo glad I did.

The plot is great, and it's not one of those 'solve in two episodes, but put a bunch of filler in the middle to make it longer'. The story is drawn out in a good way, allowing the plot to happen with plenty of antics as well, and it's not one of those "Wow, that was just like the last episode" things. Not only that, but it keeps you guessing and invested until the end.

The slash is not explicitly defined and this anime is not classified shounen-ai, but there are plenty of situations and characters that make you raise an eyebrow and wonder why. Since it's not classified as yaoi though, it's not really a tease when something doesn't happen, but the fangirl in me did get to squeal in delight a fair few times, and there is plenty of room for speculation (which really makes the show that much more fun to watch with a fellow fan).

And finally, the characters are quite lovable, each in his or her own way. Some were an immediate cling-reaction (Grell Sutcliff, I'm looking at you), and some of them took a little while to grow on me, but by the end I liked just about everyone.

Overall, I'd recommend this for anyone who's a fan of demons, butlers, and cute guys all over the place.

Now this is an anime I know and love. As well as the manga. This whole series is just simply wonderful to enjoy.

The plot is wonderful. Sometimes it strays from the real one but that’s what keeps it interesting. The whole mystery of who killed Ciel’s parents is wonderful. It is witty and fun and to have a sexy demon butler in with it even better. I can only hear hundreds of fan girls (and boys) screaming for them all. The mystery deepens as the Queen's watch dog and his pet continue to dig deeper and deeper.
Now the characters absolutely wonderful and here is what I think of them:

Ciel Phantomhive: A wonderfully stuck up child who believes he is an adult. Takes pride in himself, his ‘family’ and his country. He is truly a wonderful character.

Sebastian Michaelis: Nearly every ones favourite character in the series. His dark humour and personality makes us want more. And the fact that he is sexy and a demon is even better to behold.

The four Phantomhive servants: The main three are truly fun and hilarious. They add humour when it’s needed and it is spectacular to see them all fail in funny ways. And I just love to see them get on Ciel’s and Sebastian’s last nerves. And Tanaka….he is just there to add support.

Elizabeth Middleford: She is the spunky girl every young lord like Ciel needs. She helps lighten the mood up and is just cute (Personal feeling I don’t really like her)

Undertaker: He is just the strange creepy man that any anime needs to make it well….fun

Grell Sutcliff: Now this is someone that every anime and/or manga needs. A gender confused man with a strange personality to go with it.

Of course there are others but this review would get to long.

Overall everyone should watch this wonderfully, humorous, dark, historical, mysterical anime.

While Kuroshitsuji is not in fact yaoi or shonen-ai, there are various times within the anime that raise brows and cause it to be "slashable". Ciel Phantomhive is the stubborn heir to Phantomhive manor and the toy company. After his parents died in a fire that burnt the manor to the ground, Ciel made a contract with Sebastian Michaelis - his "akuma" (this is a play on the world butler, it literally means demon). This entertaining series shows Sebastian and Ciel, along with their useless staff, solving the crimes of late 20th century London all the while waiting for the main game... This anime is full of mystery, crime, blood, passion, and adventure. It's got blood for the boys and Sebastian for the girls. Overall there is nothing poor to say about this anime... All in all it is one of the best animes to grace television.

I was really happy to hear that this is also a manga and goes on futher then what the anime stops at. Along with they might be making a second season. But first, on to this one! Plot was good, art work great, and the ending, 'wth truely happens?!' but still sweet.

The storyline mostly focuses on though Ciel Phantomhive and is one hell of a butler Sebastian Michaels, whom is a demon Ciel made a pack with in order to get revenge on the people who ruin is life. Time is of the importance to find the ones who did so while, dealing with interesting people who are friend, foe, and of alike. Along with 'Death Gods' getting involved and evening flirting with the two, it makes for a great comedy and 'kya!' moments on what happens. Even more, when at times you can mix and match who pairs up with whom.

It has some 'fan service' in there with Pluto running around most of the time naked. He appears later on in the episodes as an enemy then a somewhat 'pet' for he is a hell dog. Along with the occasional jumping on Sebby/Sebastian adds on to the 'ek!' moments. Sebby just flirting and hinting on Ciel at times. Greil doing the same with Sebby. And Undertaker, wow...sexy creepy guy with an awesome hat. You're sure to love it, though if most of you fan girls' can stand a little jealous strike if you start to fall for Sebby.