The series is about a Japanese national who gets kidnapped by an assassin syndicate called Inferno after he had personally witnessed an assassination while visiting the United States. Inferno is a criminal organization attempting to unite all known underworld mob gangs into one conglomerate. In order to achieve their goal, Inferno deploys its assassin operatives codenamed Phantom. Among them is an amnesiac girl named Ein and the Japanese national, who was given the name Zwei as his codename after being brainwashed of his previous memory.
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