* Based on visual novel game by Nitroplus

Reiji, a Japanese high-school student, travels alone to the United States. Unfortunately he is kidnapped by a mysterious organisation called Inferno, after he comes across their top assassin. The assassin is a girl about his age who is known in the underworld as 'Phantom'. Brainwashed by Inferno, Reiji is trained to become the next top assassin alongside Phantom...

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Alternative version: Phantom: Requiem for the Phantom