The story Holic is linked to another of CLAMP, Tsubasa: RESERVoir CHRoNiCLE . The two manga deal with the same plot, but in different points of view, is planned to begin and end simultaneously. Therefore, it is common to find characters of Tsubasa in Holic, and that several events occur simultaneously in the two stories.
Kimihiro Watanuki is a young student who has the gift of seeing and attract ghosts and spirits ( Ayakashi ). One day, when attacked by an Ayakashi, ends up in a store. The owner of the place is Yuuko Ichihara , a woman who says that the fact that he entered there was no coincidence. That's a shop that carries wishes, and he had one. But to be granted, you must pay an equivalent price. Watanuki then not want to see more spirits, and to pay the price, "accepted" (and forced) the supply of Yuuko to work in his shop.