This is a sequel to the original xxxHolic series. In this anime a lesson is learnt by Watanuki-kun.
As Yuuko-san very well puts it: You not only belong to yourself, but to those who care for you and love you.
Watanuki-kun must learn that even though he believes he is all alone in this world (being an orphan and living by himself) there are those around him that appreciate him and care about him deeply. Even though Watanuki-kun might be oblivious of them, there are friends who care about him more than he knows. All is left to do is to come to that realization.