Tsubasa RESERVoir CHRoNiCLE - Season 2 Episode 16
The Other Side of Nostalgia

Sakura and Syaoran along with the other find themselves in what seems to be the Clow Country. However, they later find out that there are no people here. Fye believes this to be part of Sakuras memories and the only things present here are the things that she remembers the most, which is why there is not a single picture of Syaoran in his house. Fye says that the feather must be in the place that she is the most unknown to which in this case turns out to be the ruins. Will Syaoran get Sakuras feather back from the same place they had last been before she lost all her memories and went on this world hopping journey?