[Comics]XXXHOLiC

Kimihiro Watanuki is a high school student plagued by yokai and ayakashi, spirits with a strong attraction to him. The spirits are invisible to others and encounters with them are extremely troublesome. When he stumbles into a shop that grants wishes, however, events in his life promise to become more unusual.
Yuko Ichihara, a mysterious witch of many names and esoteric renown, owns the shop. For a price, she offers to grant Watanuki's wish to be rid of the spirits. The price, according to Yuko, must be of equal value and so, as payment, he temporarily becomes Yuko's part-time employee.

Watanuki's job consists of small errands dealing with the supernatural and household chores. His love interest, Himawari Kunogi, and "rival", Shizuka Domeki, occasionally join him in his work as per Yuko's request. The three become increasingly close despite Watanuki's annoyance with Domeki.
Yuko constantly refers to hitsuzen, meaning inevitability, destiny, or fate, as being the driving force in the world. She states that there is no such thing as coincidence, and that every single action and decision is inevitable, because without them, other related events in the future could not happen.
This story has the part which was created by referencing Wikipedia, so the licence of GFDL is applied to this story.

CLAMP
Koudansha
YOUNG MAGAZINE