When he agrees to become the "Bodyguard of Darkness" and provide protection for the high-profile Soryukai family, karate apprentice Naoto Kiba finds himself in more danger than he's ever been in before. Now, as each day unfolds, he's forced to fight off the evil Ishimine without the aid of any weapons other than his strength, smarts and considerable martial arts skills. But if anyone can keep the Soryukai safe, it's bodyguard Kiba.