Ten years after the events of xxxHOLiC Shunmuki, a melancholic Kimihiro Watanuki has taken over the shop formerly run by the mysterious Yuuko due to a promise he made to her. His companions Maru, Moro, and Mokona live together with him in relative contentment, and some familiar faces arrive every now and then: former rival turned-steadfast friend Shizuka Doumeki, and the former psychic prodigy Kohane Tsuyuri. While Kohane studies folklore under Doumeki at university, they encounter a case that is perfect for the master of the shop. Eventually, Watanuki receives a visit from Doumeki's grandfather, Haruka. He requests that Watanuki investigates his grandson's dreams. While inside the dream world, he discovers how their past adventures played out from Doumeki's perspective of view, leading Watanuki to discover truths from 10 years ago and secrets about the ties that bind their friendship.

For the appropriate price, your dearest wish can be granted at the shop of the peculiar Yuuko. Kimihiro Watanuki wishes to be rid of his ability to see spirits, and so as payment, he works for Yuuko doing whatever she needs him to do, from cleaning to errands to even helping out Yuuko's other clients. In xxxHOLiC Shunmuki, Watanuki and his friend and rival Shizuka Doumeki enjoy a meal with their friend Kohane Tsuyuri and her grandmother, reminiscing about how they have changed since meeting each other. Later on, Watanuki has a dream in which he is visited by Doumeki's grandfather Haruka, who needs him to find some things in the family temple storeroom. Accompanied by Doumeki, he finds that this task is more akin to a treasure hunt, with each item leading them to another, and another, guiding them to an unexpected yet inevitable ending.

Kimihiro Watanuki can see spirits and other assorted supernatural creatures, which is quite a bothersome ability he strongly dislikes. On the way home one day, while plagued by some spirits, he is inexplicably compelled to enter a strange house. There, he encounters Yuuko, a mysterious woman who claims to be able to rid him of the ability to see and attract the troublesome creatures—for a price. She demands that he work at her store that grants wishes to people, and thus begins Watanuki's adventures through weird and wonderful events.

Hoichiro Ohma works in an office. Everybody knows him as a silent, humble man. Even his girlfriend, Nanase, doesn't suspect that he could be something more, but he is. When a person dies as a victim of murder; when someone kills himself with a curse on his lips; when someone's death needs to be judged, he is there, for he is a Judge Of Darkness. Following the Laws Of Darkness, with a book made of human skin and an unusual parrot, he pronounces judgement over living criminals that would otherwise go free. (Source: ANN)