Tsubasa Reservoir Chronicle

Tsubasa Reservoir Chronicle (Japanese   : Tsubasa Rezaboa Kuronikuru) is a Japanese Manga made by The Mangaka Group,
CLAMP. It first time published on Shonen Magazine on May 2003. Now there are 23 series of them.

This manga tell us about a childhood friends Syaoran, a young archeologist who's investigating a ruin in the Clow Kingdom and Sakura, Clow Kingdom's Princess. One day, when Sakura visits Syaoran at the ruin, she found an old and mysterious symbol there. Then, suddenly, a pair of wings which made from Sakura's memory fragments showed up. Those wings suddenly broke and makes all the memory fragment feathers scattered all over the dimensions. When Sakura is in a condition that nearly to death, the Clow Kingdom's Priest send both Syaoran and Sakura to the Dimension Witch, Ichihara Yuuko. At the same time, Yuuko is being visited by two other guests who each have their own wish : Kurogane, a ninja who wishes to come back to his home after being displaced by Princess Tomoyo on purpose to learn what true strength is and Fye D. Fluorite, a magician who wishes to never return to his home to avoid his King, Ashura - o. In exchange for the power to cross the dimensions, Yuuko demands that each pay with thing that they value the most : Kurogane has to give his sword, Ginryu. Fye has to give tattoo that suppresses his magical power, and Syaoran has to give all Sakura's memories that involves him. Yuuko then give them a creature called Mokona Modoki that travels the group across each dimensions to find Sakura's memory feathers. After getting the first feather, Sakura is awaken and starts recovering her memories. The three of them become closer to the point that Fye jokingly labels them as relatives. As they travel, they learned that the memory feathers give supernatural power to those who posses them

Their adventure become more interesting and dangerous after they know that Syaoran and Sakura who always be with them all this time are clones and the real one is being imprisoned by Fei Wang Reed.

It's really recommended! Well, you can read the manga and download it's anime at  :

1. www.mangafox.com
2. www.animebuzz.tv *season 1 completed, season 2 completed, OVA completed