In this volume, Syaoran and the others learn there's more to the country of Oto than they realized.
Syaoran comes to discover that someone from his past is also in the country of Oto.
Syaoran and the others go to the country of Oto to find Sakura's memories.
In this volume, Syaoran and the others go to a world where children are disappearing from a particular town.
Syaoran and the others go to the next world to find Sakura's feathers and meet a girl named Chu'nyan.
In this volume, Syaoran learns about the "Kudan" while trying to find a feather with Sakura's memory.
Something like a sequel to the Cardcaptor Sakura manga series.