Pronounced like "holic" as in "alcoholic." A manga by the artistic group CLAMP. It is published in Young Magazine. The main character Watanuki is haunted by visions of spirits, and seeks help from a strange shop that grants wishes...for a price. Watanuki's price is to work as an indentured servant for the shop owner (the time-space witch, Yuuko) until he can pay off the debt for his wish. Often referrred to as "CLAMP's goth manga."
Did you read the newest chapter of XxxHolic?