Tsubasa Reservoir Chronicle - Princess of the Birdcage Kingdom

In their continuing journey to find the feathers that are the fragments of Sakura's lost memory, Syaoran, Kurogane, Fay, and Sakura move through time and space with Mokona. Here, they visit the "Country of Birdcages," a seemingly peaceful country where people and birds live together, each person having a bird companion.