Tsubasa - CLAMP

Young Syaoran and his friends are on a quest to retrieve the magically potent feather-shaped shards of Princess Sakura's memory. The search has led them to the country of Oto, a world with the romantic feel of Japan in the early 1900s. However, another dimension traveller has shown up as well - the immensely powerful Seishiro, who first trained Syaoran. Now he and Syaoran are mortal enemies! Seishiro's first act is to kill Kai, beloved wizard and one of Syaoran's closest companions. Does Syaoran, who is just beginning his training, have any hope of surviving their inevitable battle?