Reservoir Chronicle: Tsubasa is a Japanese fantasy and romance manga series. The series follows Syaoran and Sakura. Childhood friends who have become much more, set off on a mission to regain memories stolen from Sakura. In completing the mission, not only will they have to enter alternate realities to recollect her memories, but Syaoran learns his best friend will still not remember him and their relationship. They are also joined by the warrior Kurogane, and a magical creature named Mokona.