xxxHOLiC

Kimihiro Watanuki is a young boy with a cursed gift. He has the ability to see evil spirits, and somehow they seem attracted to himself. One day he meets a misterious woman who names herself Yuuko. She claims to have the means to end his torment, but she never works for free, and she wouldn't help him until he works for her enough to pay for her services. Thus he starts to work in her shop and discovers that in that place, nothing is what it seems.

Synopsis from Anime News Network