A brilliant doctor (Kairi Narita) on a quest for revenge buys a young woman (asami) and trains her to be the ultimate assassin, implanting gun parts in her body that she must later assemble and use to kill her target before she bleeds to death.
Asami has really become an international star. She broke out in "Machine Girl" and has since appeared in "Zombie Ass" and "Gothic & Lolita Psycho". This may be her first title role, or at least her biggest title role.
As others have pointed out, the wraparound story is the weakest part and seems to be a plot device to have the film be in English (a wise decision). Does it help move the story? Maybe a little, but it could have been completely removed without much hassle.
Dread Central says, "A big part of this is the amazing score by Dean Harada. All synths and metal guitars." He may be best known for "Samurai Avenger: The Blind Wolf", which also happens to be directed by this film's Kurando Mitsutake. They are spot on. Love it or hate it, Harada just dominates this film.
James Marsh says the movie "rises above its budgetary limitations in suitably sleazy style". This sums up the picture. While it does have those budget issues, and tends to be overly reliant on nude women to tantalize the audience, it will appeal to the fans of "Machine Girl" and "Tokyo Gore Police", and before long the quality is no longer an issue.