Kurau: Phantom Memory

Her name is Kurau, and in a world of mercenary agents, she's the cream of the elite; a master martial artist and thief so skilled that no secret or objective is beyond her grasp. The greatest secret of all, however, is the one Kurau conceals inside herself: The freak result of a disastrous experiment with a new kind of energy, Kurau's body has been fused with a binary alien life form called the Rynax. Every second Kurau lives is lived twice, one alien sharing her consciousness, the other still waiting to be born& and now none of those lives may last very long! The truth about Kurau has begun to leak out, a worldwide manhunt has been launched and now the ultimate agent is the ultimate target. (official distributor synopsis)