The Machine Girl
片腕マシンガール (original)
A high school girl's life is destroyed when her brother is killed. When her hand is cut off, she gets help from two mechanics, who fit her with a machine gun where her arm used to be. She unleashes her fury, avenging her brother's death.
Starring Minase Yashiro, Asami, Yûya Ishikawa, Kentarô Shimazu, Honoka, Noriko Kijima, Ryôsuke Kawamura, Nobuhiro Nishihara, Nahana, Kentaro Kishi
Watch "The Machine Girl" from streaming services Tubi TV, Fandor, Fandor (Prime) and several more released in 2008. It's a action & adventure and crime movie, and has a rating of 5.9 out of 10 from Imdb which is fairly okay for this kind of movie.
Watch it here
Tubi TV