Swept off the streets as a young boy, Raizo is transformed into an unstoppable killing machine by a secret society known as the Ozunu Clan. The Ozunu Clan is so proficient at keeping their existence a secret that most people think they are only a myth, but the moment Ozuno assassins kill Raizo's friend, their days in the shadows are numbered. In the aftermath of that killing, Raizo stages a daring escape, subsequently biding his time until the day he can take the entire Ozunu Clan down.

Later, in Berlin, Europol agent Mika Coretti discovers a money trail connecting multiple political murders to a mysterious network of elusive assassins from the Far East. While her superior Ryan Maslow orders Mika to back down and stop asking questions, she stealthily begins searching through classified agency files on a relentless mission to discover the truth about the murders. Singled out as a target as a direct result of her investigation, Mika is marked for death by lethal Ozunu assassin Takeshi . Just as Mika is about to be silenced forever, Raizo saves her from certain death. But Raizo knows that Takeshi and the rest of the Ozuno Clan won't stop until he and Mika are both dead. Now, as Raizo and Mika are hunted through the winding streets of Europe, their only hope for survival is to trust one another and stay alive long enough to bring the Ozunu empire crumbling to the ground.