English translation of the Japanese manga ×××ホリック. The title is pronounced "Holic", with the "X"s being silent.
The series regularly crosses over and ties in with Tsubasa: Reservoir Chronicle, another series by CLAMP that was published alongside this series.
Being harassed by spirits invisible to everyone but himself, high school student Kimihiro Watanuki does not know what to do until chance (or perhaps something more) has him stumble upon a shop that grants wishes run by a witch named Yūko Ichihara.
However to get rid of the spirits Kimihiro has to pay her not with money but with something of equal value to her services. Yūko decides that his working for her part-time will do, from there romance and innuendo ensue.