Phantom ~Requiem for the Phantom~

Young Reiji accidentally runs afoul of the international crime syndicate Inferno, and is indoctrinated into their fold as an assassin. Along with “Ein”, an amnesiac girl also sucked into Inferno’s assassin program, Reiji—now rechristened “Zwei”—tries to survive the underworld’s brutality while also looking for a way out for both of them.