In the late 1990s, as society descends into totalitarianism and anarchy, Saiga Riki-Oh emerges as a lone wolf dedicated to eradicating people's evil karma. He punches through gangsters, corrupt martial artists, and others to reconnect with a long-lost brother and solve the mystery behind their separated family and its connection to the Star of David on his hand, all while attracting an equal number of hot-blooded supporters and insane enemies.