Kimihiro Watanuki is a young boy with a cursed gift. He has the ability to see evil spirits, and somehow they seem attracted to him. One day he meets a mysterious woman who names herself Yuuko. She claims to have the means to end his torment, but she never works for free, and won’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.
Descriptions taken from AniDB.net