Tsubasa: Reservoir Chronicle

Sakura is the princess of Clow kingdom, which is ruled by her older brother, King Tōya. Her childhood friend Syaoran is a young archaeologist. Sakura is revealed to have strange powers when she has a vision of a mysterious symbol and places she has never seen. Meanwhile, Syaoran discovers the same symbol at the ruins he is excavating. He sees Sakura standing on the symbol on the ground. Ghostly wings appear on her back and a mysterious force begins to pull her into the walls of the ruins. Syaoran rescues her in time, but her wings are scattered across dimensions. The High Priest of Clow Kingdom, Yukito, immediately realizes that Sakura's "wings" were the manifestation of her soul and memories; without them, she will die. In order to save Sakura, Syaoran must journey to retrieve her wings' feathers, the fragments of her memories.