Rozen Maiden is a Japanese TV anime series that ran for two seasons 2004/5 plus a 2006 Christmas special. It was popular there but will never be shown in the UK, but then no Japanese anime series of this kind will be shown outside Japan.
Why not? It's a cultural difference. Rozen Maiden is made for teenagers not children. The central (human) characters are all teenagers, and the human plotlines revolve around specifically teenage concerns.
Oh, sorry, go read some background. Read, now!
I watched the whole series over the holidays, it was my treat one episode a day since the TV had nothing I wanted to see except for Kiki's Delivery Service which is, oh dear, an anime. It was... wonderful, the best anime I've watched since 'Scrapped Princess'. I could type pages over how wonderful it is, but I don't expect to convince anyone so, duely noted.
Now my question: am I the only person who can see this? Rozen Maiden is 'Highlander' as played out by magic dolls. Consider: immortal beings who are destined to fight until one is left who gains a great prize? A story which has amongst its themes the consequences of being immortal; the effects on the mortals around them who will grow old and die as they go on?