Platinum Garden

Platinum Garden summary:

When Kazura Enomotos' grandfather dies, he leaves her to the son of a mysterious, rich family, Mizuki Magahara, as payment for his debts. After she goes to live with him, Kazura learns that she's not going to be working off the debts as a servant; instead she's going to be Mizuki's fiancée! Unless she can pay her grandfather's debt, she's got no choice but to learn to live with him! Right when Kazura begins adjusting to her hectic life, the dark secret of the Magahara family is revealed. The head of the family has the unique power to bring back the souls of the dead, and right now the head of the family is Mizuki!