Tsubasa/xxxHOLiC project. 
A 4 part OVA consisting of two OVAs for each series, with plots linked together. Direct sequel to the events on xxxHOLiC - Kei, with special guests.

Still working to get his wish complete, Watanuki finds himself into more mess than he can handle when certain facts about his everyday life gets revealed and when he needs to learn the lesson of Yuuko the hard way.
 
(Source: Anime News Network)

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. 
(Source: MAL Rewrite)

Kimihiro Watanuki is haunted by visions of ghosts and spirits. He seeks help from a mysterious woman named Yuko, who claims she can help. However, Watanuki must work for Yuko in order to pay for her aid. Soon Watanuki finds himself employed in Yuko’s shop where he sees things and meets customers that are stranger than anything he could have ever imagined.
 
(Source: Kodansha USA)
 
Notes: 
- The series was re-named to xxxHolic&bull;Rou on chapter title pages of chapter 186 and on, but not on their volume's front covers, spines and indicia. 
- The chapter count contains a one-shot published in May 2010 to commemorate the switch, which was later collected into Volume 18. 
- The chapter count also reflects the magazine releases; the chapters plus the one-shot were re-arranged into 109 chapters across 19 volumes.

Tsubasa/xxxHOLiC Project 
A 4 part OVA released with the limited editions of the Tsubasa and xxxHOLiC volumes. 
There are two OVAs for each series, with plots linked together. 
They cover the Nihon Country Arc and scarcely some of the Celes Country Arc. 
(Source: Official Project Website)

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