X

X (X−エックス−) is a manga series by CLAMP. It was later serialized into a TV anime series directed by Yoshiaki Kawajiri.

Plot
Kamui stands alone at the crossroads between salvation and Armageddon. Torn between rival orders of superhuman warriors, the time has come for him to choose his side. Either he fights with the Dragons of Heaven to save civilization, or he must draw swords alongside the Dragons of Earth and deliver a death blow to the human race. Whatever his choice, there will be consequences.

Links

 * Official American Website
 * Wikia