Tsubasa: RESERVoir CHRoNiCLE

Warmhearted Syaoran has always been friends with Sakura—the princess of the Clow Kingdom who holds an extraordinary power capable of changing the world. When a mysterious man attempts to monopolize Sakura's ability, her memories scatter throughout different worlds in the form of feathers. To save Sakura, Syaoran seeks help from the Dimensional Witch and meets two other travelers—Kurogane and Fai D. Flourite. Kurogane, a capable fighter and ninja, has been banished from his homeworld and wishes to return. In contrast, Fai, a magician from Celes, wants to traverse different worlds to avoid his home and past. As the price to cross dimensions, each of the three must sacrifice their most valued possession. For Sakura's sake, Syaoran agrees to give away their relationship as payment to the Dimensional Witch. And with firm determination, Syaoran, Kurogane, and Fai begin journeying through numerous worlds to fight against their ill-fated destinies. (Source: MAL)