The beautiful and egotistical Prince Ludwig is a shameless player who will pursue any woman with a hot body, a cute face, and enormous breasts. But what he really loves is the pale serenity of a beautiful corpse, a preference reflected by the countless dead babes that decorate his bedroom. This hobby repulses the king, who exiles his son until he can find a bride who's actually alive. In his quest to woo a suitable princess, the haughty youth will face many obstacles, including a cursed hand puppet that turns its wearer into a frog, an assassin with a hood stained red with blood, and worst of all: fake breasts.
Another manga by Kaori Yuki about a very pretty young man who wanders around and encounters various mysteries. Both draw a lot of inspiration from European fairy tales and nursery rhymes, and most of the mysteries involve murder, incest, or something similarly gloomy.
Also by Kaori Yuki is Godchild, and before that, Cain Saga. Cain saga is five volumes, and Godchild, it's part two in a way, is eight.
It features a main character born in a high uppercrust family, with wealth and a manservant at his beck and call, much like Ludwig Kakumei. Godchild also has Kaori Yuki's trademark "Grimms Fairytales" idea, with nursery rhymes and seemingly innocent children's poems twisted into something morbid and dark. Very entertaining those looking for a gothic read with grisly scenes and taboo subjects thrown in.