Reunited by their master's death, martial artists Ryû and Ken soon find themselves up against the criminal organization Shadowlaw in this kinetic anime tale. As Ryû grapples with a sinister force building inside him, a boy claiming to be Ryû's long-lost sibling arrives on the scene -- and is promptly abducted. But the kidnapping is merely part of a grand scheme by Shadowlaw's megalomaniacal leader to exploit Ryû and rule the world.