I read this manga a while back. It was licensed under Tokyopop I believe but I think they discontinued translating it because I remember I wouldn't see any more volumes after book 3 or so. The manga had a very gothic feel to it. The story was about these two sisters where one of them was kidnapped(?) I cant recall exactly (my memory is fogged). Anyway, the other sister tries to save her with the help of a guy that could fight.
I also remember the fashion of the sisters were very lolita style. The sister that was kidnapped was always dressed in white and the main girl black lolita clothes.
If it helps (and I might be wrong), I THINK the English title has the word "Dark" in it buuuut I'm not too sure cause it's been forever.
OMFG I FINALLY FOUND IT! I FINALLY FOUND IT!
Only the twins Clalisa (open) and Mizeria (close) control the Four Doors that protect the world from descending into chaos. When Rihitel, their guardian, kidnaps Clalisa, he weakens the Door of Chaos as demons begin to pour through and threaten to destroy the entire kingdom. Will Mizeria find her sister in time to restore order to the world?