When a mysterious loner and Karate master Kenji's little sister goes missing in Los Angeles, whoever stands in his way of finding her will face the wrath of a lethal KARATE KILL!

GUN WOMAN follows a Japanese doctor who vows revenge on a crazy sadistic killer after the man murdered his loving wife. Despite the maximum security that surrounds this billionaire, the doctor finds a perfect assassination plan when he turns a young Japanese woman into the most lethal assassin the world has ever seen. This outrageous plan -- his only chance for revenge -- will happen at an underground facility where the killer goes to fulfill his sexual fetishes. On the night before the plan is to be executed, the woman assassin is "completed" by the doctor... She is now, GUN WOMAN.

As a teenager, Yoko discovers that she is not really an orphan when her wealthy but very strange family welcomes her home to a mansion that many claim is haunted.

Ami is a typical college girl. She's bright, friendly, popular and athletic, with nothing to set her apart from other girls her age other than the fact that she is an orphan, left to care for her younger brother after her father committed suicide after being falsely accused of murder. But while there is tragedy in their past, the siblings' future looks good, except for one thing. Ami's brother has racked up a considerable debt to another boy at school, and that boy just happens to be the heir to a clan of vicious ninja-yakuza. Ami's brother can't pay, violence breaks out and in the course of trying to avenge her brother, Ami is captured by the clan. They torture her and hack her arm right off. Ami escapes, barely alive, and is taken in by the owners of a machine shop who build her a customized, bullet-spewing arm. From that point, the quest for revenge is on in earnest.