If you liked
Hakushaku to Yousei
|
...then you might like
Kuroshitsuji
|
Sebastian and Raven are both devoted butlers with demon-alike abilities, English nobility everywhere, XIX century setting and I guess that's all.
If you liked
Hatenkou Yuugi
|
...then you might like
Hakushaku to Yousei
|
Both stories mostly made of romantic line as a background to some adventures. The main heroine doesn't seem to be taken seriously by main male characters. Btw th romantic line is partially indefinite (no clear-cut love and kisses ending for you).
If you liked
Code Geass: Hangyaku no Lelouch
|
...then you might like
Kuroshitsuji
|
Both the protagonists of Kuroshitsuji and Code Geass are very similar - from the fact they both follow the way of self-destruction and vengeance to the order issuing abilities and proficiency in chess. In general, Ciel looks like a chibi version of Lelouch, not smart and skilled enough to pwn anyone he wants through strategy, relying on his butler Sebastian instead. (btw one of Shinigami in Kuroshitsuji is voiced by Jun Fukuyama.) English nobility, royal family members, tons of pathos, the only difference is XIX and XXI centuries, so no mecha in Kuroshitsuji.