Black Butler (2014), directed by Kentaro Otani and Keiichi Sato and based on the manga by Yana Toboso, follows a young noble and her demonic butler as they investigate a series of mysterious deaths. The film combines elements of mystery with supernatural themes in a stylized setting.

Från IMDB:
After her supposed death, a young woman returns as the son of her noble family to precede the family's prestigious company, with a demon at her side to avenge her parent's murder.