I find Japanese animes so thought-provoking, and this one's no exception.
A world of robots, programmed to look after humans every need, continue to function even though the humans have gone. Whenever one starts to malfunction, it seeks out the repair robot. Malice, a robot prostitute, is looking for the repairer when it comes across a peculiar creature that turns it into a real-life human female.
She is unaware of what has happened to her, but realises something is different and thinks she still needs repair. When she tries to ask the other robots what might be wrong, they don't recognise her as one of them, and won't have anything to do with her. The way this odd situation is explored is what I find so interesting.
As usual, I didn't guess the ending!