"Detective Sergeant Mariko Oshiro has been promoted to Japan's elite Narcotics unit-and with this promotion comes a new partner, a new case, and new danger. The underboss of a powerful yakuza crime syndicate has put a price on her head, and he'll lift the bounty only if she retrieves an ancient iron demon mask that was stolen from him in a daring raid. However, Mariko has no idea of the tumultuous past carried within the mask-or of its deadly link...

The deadly weapons of the last Koga Ninja have now been entrusted to an American Ninjutsu student studying in Japan. Commanded by his Sensei to return to New York and protect the weapons at all cost, he must defeat the skilled Yakuza assassins hunting him and prevent the power of the weapons from falling into evil hands.