The Machine Girl (片腕マシンガール, Kataude Mashin Gāru?) is a 2008 Japanese action shock/gore film written and directed by Noboru Iguchi with special effects by Yoshihiro Nishimura (who went on to direct Tokyo Gore Police). The film stars Minase Yashiro as Ami, Asami as Miki, Kentarō Shimazu as Ryūgi Kimura and Honoka as his wife. It is about an orphaned Japanese schoolgirl whose life is destroyed when her brother is killed by a the son of a Ninja-Yakuza clan. When her hand is cut off, she replaces it with a makeshift machine gun and seeks revenge.

Ami Hyūga is an average high school girl whose world comes crashing down when her brother Yu and his friend Takeshi Sugihara are killed by bullies, led by Sho Kimura. As Ami tracks down Sho, she discovers that the bullies are associated with a ninja-yakuza family. She goes after the clan for revenge, but they brutally overpower her, cutting off her left arm. Ami escapes and seeks out shelter from Takeshi's parents, Suguru and Miki Sugihara, two kindly garage mechanics who fit her with a multi-barrelled machine gun prosthetic. Ami and Miki (who uses a chainsaw) go after the clan, massacring them one by one. Their victims' families, meanwhile, band together to get revenge of their own.

Eventually, they reach the yakuza's hiding place. As the fight continues, Miki loses her right foot and eventually dies. Ami loses her machine gun doing her fight with Sho's father Ryūgi Kimura, but gets Miki's chainsaw. Finding Sho with hostages to keep Ami at bay, his mother Violet Kimura manages to disarm Ami while attempting to kill her with her drill bra. However, noticing one of the hostages wet himself, Ami takes advantage and trips Violet onto the urine, electrocuting her. She then kills Sho. Feeling she has nothing left to live for, she attempts to commit suicide. At that moment, however, Ami hears noise behind her and turns, sword at the ready.