The story is about a girl, Rosette, who wants to find her little brother (he's missing at that time), her comrade is a demon, but he's very kind, and protective, and wants to find her brother as well for her sake. it's a sweet story, with action, demons, and mysteries.
I think the art is pretty good, especially for an anime, the art is an important thing for an anime, and I think they succeed with that.
The personalities could have been better worked out, especially with Rosette. She's not really an original character, as with the most girls, she's very protective and thinks first about others than herself. But I don't think the characters are bad or something, 'cause they're good, but it could have been better.
I really enjoyed this serie, (not all the time, some moments were very sad) but it's easy to watch at it. It was definetly one of the better series I have watched.
This anime is certainly a must !!