if you haven't seen Black Butler, you've most likely heard PopAsia host Jamaica go on about it as "one of her favourite animes of all time" or about the new live action adaptation that was only just released.
AnimeLab also has a whole stack of animes you can stream online free. Check out their website for more info.
"Sebastian Michaelis is more than just one hell of a butler. He's a lonely boy's everything. Summoned from darkness, Sebastian serves Ciel with a sly smile. He brews the morning tea with care, gently dresses his ward in the daintiest of robes, and quashes the Young Master's enemies with a flourish! But following orders can be quite the bore, and Sebastian grows ever so hungry... Before he can silence the rumble of his stomach, however, there is the small matter of an unholy union, a contract if you will. The Butler must locate and exterminate the nefarious ne'er-do-wells responsible for the murder of his Young Master's most unfortunate parents. Then - and only then - may Sebastian reveal his true form and dine on the delicacy that is Ciel's scrumptious soul. And while the demon devours his prize, all of London shall burn." - Anime Lab