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Reiji's life is changed forever when he is the chance witness to an assassination. The organization perpetrating the murder gives him a choice: have his memory erased and work for them, or die. Reiji chooses to live and now he is a highly skilled, trained killer with no memory of ever being otherwise. Another assassin named Zwei, a girl whose code name is Phantom, becomes closer to Reiji, and as the two form a bond amid the bloodiness of hired killing, the walls holding them in their violent life seem closer everyday. The two may have no past, but could they share a future?