Thomas Hoshino is a tough Japanese detective, who lost his partner by a deadly Yakuza killer Jaho. He tracks down the killer and his master to Los Angeles, where he teams up with Det. Karen Ryder. Soon they discover that Jaho is preparing a gang war and weapon smuggling ring. Hoshino must find a way to defeat the killer who posses mystical ninja powers.

When a prostitute is found dead in a Los Angeles skyscraper occupied by a large Japanese corporation, detectives John Connor and Web Smith are called in to investigate. Although Connor has previous experience working in Japan, cultural differences make their progress difficult until a security disc showing the murder turns up. Close scrutiny proves the disc has been doctored, and the detectives realize they're dealing with a cover-up as well.