Pinocchio 964 is a Japanese cyberpunk film, strongly relying on themes of human transformation, so if you've had a recommendation from someone who saw a "Tetsuo" movie in your collection, you're at the right place.
Set in a world where a company secretly supplies mind-wiped sex slaves, pinocchio is thrown out by his owner to the streets after being mind-wiped again. He survives thanks to a new found friend who maps the streets for similar cases. As he learns how to be human once more, he undergoes a transformation, and his friend undertakes her own, while avoiding the sex slave company, who are trying to silence them both (permanently) to cover their dealings.
It's not an easy watch, there isn't a great deal of dialogue in the movie, and there are some strong scenes (a literal 5 minutes of vomiting in one scene, and some violent effects alongside deliberately ugly photography), the movie stands in its own world, with its own sense of logic and works.
It takes a particular frame of mind to watch (the lack of dialogue, or at least meaningful dialogue) makes it at points makes it uncomfortable to watch, but gives a definite sense of achievement and purpose from watching it.
Allegedly unavailable in many places, this is a rare find, and worth the investment if you have a taste for such film.