It's a very good anime and quite different in some aspects, I think the main thing is the seriousness. It's all "adult" and serious, there's no comic relief, usually a slapstick character being responsible for it, but that doesn't mean the anime isn't fun. The story is very good, the characters are well-built, the world and setting are consistent and convincing. The protagonist duo has good chemistry and evolves well, going from "this prince is a pain" to "I will dedicate my life to him". The prince is very intelligent, which is required by the plot that the story delivers, bringing surprises and twists until thevery last moment.