Shaoran and Sakura visit the Birdcage Land guided by Mokona-and-Modoki who were loaned by Yuuko, the Dimension Witch.
This world was supposed to be a peaceful land where people lived with birds as partners. But now the king is oppressing his subjects: those who do not obey him are deprived of their birds, and the people have come to live in misery. The king rules the land…