10 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.

Kimihiro Watanuki is a young boy with a cursed gift. He has the ability to see evil spirits, and somehow they seem attracted to himself. One day he meets a misterious woman who names herself Yuuko. She claims to have the means to end his torment, but she never works for free, and she wouldn’t help him until he works for her enough to pay for her services. Thus he starts to work in her shop and discovers that in that place, nothing is what it seems. Genre: Comedy, drama, fantasy, horror, mystery, psychological, slice of life, supernatural, ghosts, occult

Yuuko receives a letter from an unknown sender. It is an invitation to an auction. Seven avid collectors were invited to an old mansion. They all admit that they accepted the invitation to complete their collections. They waited for the host, but he does not make an appearance. And one by one the collectors disappear. The strange host and a mysterious girl. A night where odd things happen one after another. What is being auctioned? Who is the host? The cunning and foolish people who are obsessed with "possessions" and the host's "timeless" passion. What is waiting at the end of this enigmatic series of riddles? And what is the conclusion of the sad love story behind them? Mystery leads to mystery, and reaches the unexpected!