XxxHOLiC

XxxHOLiC is a manga series by CLAMP. It was later serialized into a TV anime series directed by Tsutomu Mizushima.

Plot
Watanuki’s been haunted by dark spirits his entire life. His incessant demons drag him to the ornate door of the Dimensional Witch Yuko, a mystical woman of insight and luxury who is quick to help those in a bind—for a fee. One might very well end up paying with their soul! To be free of his visions, Watanuki will work in her strange shop of dreams and wishes.

Links

 * Official Japanese Website
 * Official American Website
 * Wikia